Add comprehensive repository documentation

[Copilot]

• Restructure REPOSITORY_SUMMARY.md based on user feedback
• Move Data Flow Workflow before Repository Structure
• Add visual separators between directory sections
• Expand interpolation section with reference grid details
• Simplify Supported Datasets to list format
• Remove Key Features section
• Remove Environment from Technical Details
• Add interpolation to Usage Examples

Original prompt

This git is a repository to download and make some small transformation of the cds climatic data downloaded. Read it and understand how it work then explain it to me in a summary

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[chantreux]

@copilot Ok not bad! I want to simplify it :

• eliminate Key Feature entirely
• eliminate Environmnet in Technical details
• put the workflow before the structure I think is a btter introduction
• in the structure seperate better each directory visually
• you forgot about the interpolation : is another step, it interpolates any dataset by a reference grid that is referenced in a column of the csv request (see cerra-single levels as aan example). This will be expanded cerra is the example for future updates, the reference gris will be updated in a resources folder.
• In Supported Datasets: just make a list and eliminate the descriptions

[Copilot]

@copilot Ok not bad! I want to simplify it :

• eliminate Key Feature entirely
• eliminate Environmnet in Technical details...

Done! Changes in commit a046d71:

• ✅ Removed Key Features section
• ✅ Removed Environment from Technical Details
• ✅ Moved workflow before structure
• ✅ Added visual separators (---) between each directory
• ✅ Expanded interpolation section with details about reference grids, conservative interpolation, and note about CERRA as reference example
• ✅ Simplified Supported Datasets to a simple list
• ✅ Added interpolation step to workflow and usage examples