docs: add Simple Rubric documentation and rename to Generate Rubrics …

[XieLipeng0830]

…as Graders

OpenJudge Version

[The version of OpenJudge you are working on, e.g. import openjudge; print(openjudge.__version__)]

Description

[Please describe the background, purpose, changes made, and how to test this PR]

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with pre-commit run --all-files command
• All tests are passing
• Docstrings are in Google style
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[gemini-code-assist]

Summary of Changes

Hello @XieLipeng0830, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing and clarifying the documentation for rubric generation within the OpenJudge project. It renames the 'Data-Driven Rubrics' concept to 'Generate Rubrics as Graders' to better reflect its broader scope, which now includes a new 'Simple Rubric' method for generating rubrics from task descriptions without requiring labeled data. All relevant links and descriptions across the READMEs, overview pages, and navigation have been updated to align with these changes, providing a more coherent and comprehensive guide for users on different rubric generation strategies.

Highlights

• Documentation Restructuring: The documentation related to generating evaluation rubrics has been significantly updated and restructured for clarity and consistency.
• New Rubric Generation Method: A new 'Simple Rubric' method has been introduced, enabling zero-shot rubric generation directly from task descriptions without requiring labeled data.
• Renamed Approach: The 'Data-Driven Rubrics' approach has been renamed to 'Generate Rubrics as Graders'. This new umbrella term now encompasses both the 'Simple Rubric' and the existing 'Iterative Rubric' methods.
• Documentation File Removal: The previous documentation file generate_graders_from_data.md has been removed, indicating a consolidation or replacement of its content under the new structure.

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Code Review

This pull request primarily renames the 'Generate Graders from Data' feature and its associated documentation to 'Generate Rubrics as Graders'. The changes include updating descriptions in README.md, README_zh.md, docs/building_graders/overview.md, and docs/index.md to clarify that rubrics can be generated using either a 'Simple Rubric' method (from task description) or an 'Iterative Rubric' method (from labeled data). All internal links and navigation entries in mkdocs.yml and other documentation files have been updated to reflect this new naming, and the old documentation file generate_graders_from_data.md has been removed. There were no review comments provided for this pull request.