docs: adjust doc links and sync config (#3136)

## Why?

<!-- Describe the purpose of this PR. -->

## What does this PR do?

apache/fory-site#387 refactored code sturcture,
now relative links can be resolverd correctly. We can change back
relative path now.

## Related issues

apache/fory-site#387

## Does this PR introduce any user-facing change?

<!--
If any user-facing interface changes, please [open an
issue](https://github.com/apache/fory/issues/new/choose) describing the
need to do so and update the document if necessary.

Delete section if not applicable.
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- [ ] Does this PR introduce any public API change?
- [ ] Does this PR introduce any binary protocol compatibility change?

## Benchmark

<!--
When the PR has an impact on performance (if you don't know whether the
PR will have an impact on performance, you can submit the PR first, and
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it), be sure to attach a benchmark data here.

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Author: chaokunyang

.github/sync.yml

@@ -17,7 +17,7 @@
 
 apache/fory-site@main:
   - source: docs/guide/
-    dest: docs/docs/guide/
+    dest: docs/guide/
   - source: docs/specification/
     dest: docs/specification/
   - source: docs/benchmarks/

docs/guide/go/cross-language.md

@@ -76,7 +76,7 @@ user = fory.deserialize(data)
 
 ## Type Mapping
 
-See [Type Mapping Specification](https://fory.apache.org/docs/specification/xlang_type_mapping) for detailed type mappings across all languages.
+See [Type Mapping Specification](../../specification/xlang_type_mapping.md) for detailed type mappings across all languages.
 
 ## Field Ordering
 
@@ -278,5 +278,5 @@ Ensure other languages handle null appropriately.
 - [Type Registration](type-registration.md)
 - [Supported Types](supported-types.md)
 - [Schema Evolution](schema-evolution.md)
-- [Xlang Serialization Specification](https://fory.apache.org/docs/specification/fory_xlang_serialization_spec/)
-- [Type Mapping Specification](https://fory.apache.org/docs/specification/xlang_type_mapping)
+- [Xlang Serialization Specification](../../specification/xlang_serialization_spec.md)
+- [Type Mapping Specification](../../specification/xlang_type_mapping.md)

docs/guide/go/index.md

@@ -159,6 +159,6 @@ See [Cross-Language Serialization](cross-language.md) for type mapping and compa
 
 ## Related Resources
 
-- [Xlang Serialization Specification](https://fory.apache.org/docs/specification/fory_xlang_serialization_spec)
-- [Cross-Language Type Mapping](https://fory.apache.org/docs/specification/xlang_type_mapping)
+- [Xlang Serialization Specification](../../specification/xlang_serialization_spec.md)
+- [Cross-Language Type Mapping](../../specification/xlang_type_mapping.md)
 - [GitHub Repository](https://github.com/apache/fory)

docs/guide/java/cross-language.md

@@ -159,7 +159,7 @@ Not all Java types have equivalents in other languages. When using xlang mode:
 - Use **primitive types** (`int`, `long`, `double`, `String`) for maximum compatibility
 - Use **standard collections** (`List`, `Map`, `Set`) instead of language-specific ones
 - Avoid **Java-specific types** like `Optional`, `BigDecimal` (unless the target language supports them)
-- See [Type Mapping Guide](https://fory.apache.org/docs/specification/xlang_type_mapping) for complete compatibility matrix
+- See [Type Mapping Guide](../../specification/xlang_type_mapping.md) for complete compatibility matrix
 
 ### Compatible Types
 
@@ -210,7 +210,7 @@ Cross-language mode has additional overhead compared to Java-only mode:
 ### "Type mismatch" errors
 
 - Ensure field types are compatible across languages
-- Review [Type Mapping Guide](https://fory.apache.org/docs/next/specification/xlang_type_mapping)
+- Review [Type Mapping Guide](../../specification/xlang_type_mapping.md)
 
 ### Data corruption or unexpected values
 
@@ -219,8 +219,8 @@ Cross-language mode has additional overhead compared to Java-only mode:
 
 ## See Also
 
-- [Cross-Language Serialization Specification](https://fory.apache.org/docs/next/specification/fory_xlang_serialization_spec)
-- [Type Mapping Reference](https://fory.apache.org/docs/next/specification/xlang_type_mapping)
+- [Cross-Language Serialization Specification](../../specification/xlang_serialization_spec.md)
+- [Type Mapping Reference](../../specification/xlang_type_mapping.md)
 - [Python Cross-Language Guide](../python/cross-language.md)
 - [Rust Cross-Language Guide](../rust/cross-language.md)
 

docs/guide/python/cross-language.md

@@ -128,8 +128,8 @@ The binary protocol and API are similar to `pyfory`'s python-native mode, but Py
 
 ## See Also
 
-- [Cross-Language Serialization Specification](https://fory.apache.org/docs/next/specification/fory_xlang_serialization_spec)
-- [Type Mapping Reference](https://fory.apache.org/docs/next/specification/xlang_type_mapping)
+- [Cross-Language Serialization Specification](../../specification/xlang_serialization_spec.md)
+- [Type Mapping Reference](../../specification/xlang_type_mapping.md)
 - [Java Cross-Language Guide](../java/cross-language.md)
 - [Rust Cross-Language Guide](../rust/cross-language.md)
 

docs/guide/rust/cross-language.md

@@ -129,7 +129,7 @@ person = fory.deserialize(bytes_from_rust)
 
 ## Type Mapping
 
-See [xlang_type_mapping.md](https://fory.apache.org/docs/specification/xlang_type_mapping) for complete type mapping across languages.
+See [xlang_type_mapping.md](../../specification/xlang_type_mapping.md) for complete type mapping across languages.
 
 ### Common Type Mappings
 
@@ -153,8 +153,8 @@ See [xlang_type_mapping.md](https://fory.apache.org/docs/specification/xlang_typ
 
 ## See Also
 
-- [Cross-Language Serialization Specification](https://fory.apache.org/docs/next/specification/fory_xlang_serialization_spec)
-- [Type Mapping Reference](https://fory.apache.org/docs/next/specification/xlang_type_mapping)
+- [Cross-Language Serialization Specification](../../specification/xlang_serialization_spec.md)
+- [Type Mapping Reference](../../specification/xlang_type_mapping.md)
 - [Java Cross-Language Guide](../java/cross-language.md)
 - [Python Cross-Language Guide](../python/cross-language.md)
 

docs/guide/xlang/field-nullability.md

@@ -247,5 +247,5 @@ Schema B: { name: String (nullable) }
 
 - [Reference Tracking](field-reference-tracking.md) - Shared and circular reference handling
 - [Serialization](serialization.md) - Basic cross-language serialization
-- [Type Mapping](https://fory.apache.org/docs/specification/xlang_type_mapping) - Cross-language type mapping reference
-- [Xlang Specification](https://fory.apache.org/docs/specification/fory_xlang_serialization_spec) - Binary protocol details
+- [Type Mapping](../../specification/xlang_type_mapping.md) - Cross-language type mapping reference
+- [Xlang Specification](../../specification/xlang_serialization_spec.md) - Binary protocol details

docs/guide/xlang/field-reference-tracking.md

@@ -257,4 +257,4 @@ b.next = a;  // Circular reference
 
 - [Field Nullability](field-nullability.md) - How nullability affects serialization
 - [Serialization](serialization.md) - Basic cross-language serialization examples
-- [Xlang Specification](https://fory.apache.org/docs/specification/fory_xlang_serialization_spec) - Binary protocol details
+- [Xlang Specification](../../specification/xlang_serialization_spec.md) - Binary protocol details

docs/guide/xlang/getting-started.md

@@ -287,6 +287,6 @@ print(f"Name: {person.name}, Age: {person.age}")
 
 ## Next Steps
 
-- [Type Mapping](https://fory.apache.org/docs/specification/xlang_type_mapping) - Cross-language type mapping reference
+- [Type Mapping](../../specification/xlang_type_mapping.md) - Cross-language type mapping reference
 - [Serialization](serialization.md) - Detailed serialization examples
 - [Troubleshooting](troubleshooting.md) - Common issues and solutions

docs/guide/xlang/index.md

@@ -101,14 +101,14 @@ print(f"{person.name}, {person.age}")  # Alice, 30
 
 ## Documentation
 
-| Topic                                                                         | Description                                      |
-| ----------------------------------------------------------------------------- | ------------------------------------------------ |
-| [Getting Started](getting-started.md)                                         | Installation and basic setup for all languages   |
-| [Type Mapping](https://fory.apache.org/docs/specification/xlang_type_mapping) | Cross-language type mapping reference            |
-| [Serialization](serialization.md)                                             | Built-in types, custom types, reference handling |
-| [Zero-Copy](zero-copy.md)                                                     | Out-of-band serialization for large data         |
-| [Row Format](row_format.md)                                                   | Cache-friendly binary format with random access  |
-| [Troubleshooting](troubleshooting.md)                                         | Common issues and solutions                      |
+| Topic                                                     | Description                                      |
+| --------------------------------------------------------- | ------------------------------------------------ |
+| [Getting Started](getting-started.md)                     | Installation and basic setup for all languages   |
+| [Type Mapping](../../specification/xlang_type_mapping.md) | Cross-language type mapping reference            |
+| [Serialization](serialization.md)                         | Built-in types, custom types, reference handling |
+| [Zero-Copy](zero-copy.md)                                 | Out-of-band serialization for large data         |
+| [Row Format](row_format.md)                               | Cache-friendly binary format with random access  |
+| [Troubleshooting](troubleshooting.md)                     | Common issues and solutions                      |
 
 ## Language-Specific Guides
 
@@ -121,5 +121,5 @@ For language-specific details and API reference:
 
 ## Specifications
 
-- [Xlang Serialization Specification](https://fory.apache.org/docs/next/specification/fory_xlang_serialization_spec) - Binary protocol details
-- [Type Mapping Specification](https://fory.apache.org/docs/next/specification/xlang_type_mapping) - Complete type mapping reference
+- [Xlang Serialization Specification](../../specification/xlang_serialization_spec.md) - Binary protocol details
+- [Type Mapping Specification](../../specification/xlang_type_mapping.md) - Complete type mapping reference