docs: standardize README shields and add dev-guide badge

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: grokify

README.md

@@ -3,8 +3,8 @@
 [![Go CI][go-ci-svg]][go-ci-url]
 [![Go Lint][go-lint-svg]][go-lint-url]
 [![Go SAST][go-sast-svg]][go-sast-url]
-[![Go Report Card][goreport-svg]][goreport-url]
 [![Docs][docs-godoc-svg]][docs-godoc-url]
+[![Docs][docs-mkdoc-svg]][docs-mkdoc-url]
 [![Visualization][viz-svg]][viz-url]
 [![License][license-svg]][license-url]
 
@@ -14,16 +14,16 @@
  [go-lint-url]: https://github.com/grokify/gogithub/actions/workflows/go-lint.yaml
  [go-sast-svg]: https://github.com/grokify/gogithub/actions/workflows/go-sast-codeql.yaml/badge.svg?branch=main
  [go-sast-url]: https://github.com/grokify/gogithub/actions/workflows/go-sast-codeql.yaml
- [goreport-svg]: https://goreportcard.com/badge/github.com/grokify/gogithub
- [goreport-url]: https://goreportcard.com/report/github.com/grokify/gogithub
  [docs-godoc-svg]: https://pkg.go.dev/badge/github.com/grokify/gogithub
  [docs-godoc-url]: https://pkg.go.dev/github.com/grokify/gogithub
+ [docs-mkdoc-svg]: https://img.shields.io/badge/Go-dev%20guide-blue.svg
+ [docs-mkdoc-url]: https://grokify.github.io/gogithub
  [viz-svg]: https://img.shields.io/badge/visualizaton-Go-blue.svg
  [viz-url]: https://mango-dune-07a8b7110.1.azurestaticapps.net/?repo=grokify%2Fgogithub
  [loc-svg]: https://tokei.rs/b1/github/grokify/gogithub
  [repo-url]: https://github.com/grokify/gogithub
  [license-svg]: https://img.shields.io/badge/license-MIT-blue.svg
- [license-url]: https://github.com/grokify/gogithub/blob/master/LICENSE
+ [license-url]: https://github.com/grokify/gogithub/blob/main/LICENSE
 
 **[Documentation](https://grokify.github.io/gogithub/)** | **[API Reference](https://pkg.go.dev/github.com/grokify/gogithub)**