redirect RTD to shared Mintlify docs

[willccbb]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

---

Note

Redirects the RTD site to docs.primeintellect.ai/verifiers and deletes Sphinx-based docs and related config.

• Documentation / RTD:
  • Replace Sphinx build with a redirect: update .readthedocs.yaml to copy docs/rtd-redirect/index.html to $READTHEDOCS_OUTPUT/html/index.html.
  • Add docs/rtd-redirect/index.html that redirects to https://docs.primeintellect.ai/verifiers.
  • Remove Sphinx artifacts: delete docs/source/conf.py, docs/Makefile, docs/README.md, and docs/requirements.txt.
  • Remove docs optional extra from pyproject.toml.

^{Written by Cursor Bugbot for commit f7d21f5. This will update automatically on new commits. Configure here.}