docs: update deployment workflow to use requirements.txt for dependen…

[HarshitRuwali]

…cies

[Copilot]

Pull request overview

This PR updates the documentation deployment workflow to install MkDocs dependencies from a checked-in docs/requirements.txt, aligning CI installs with a standard pip requirements file.

Changes:

• Add docs/requirements.txt to define MkDocs/MkDocs Material dependencies.
• Update the GitHub Actions docs deployment workflow to pip install -r docs/requirements.txt and cache based on that file.
• Stop ignoring pyproject.toml and uv.lock in .gitignore (those files are not present in the repo).

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/requirements.txt	Introduces a dedicated requirements file for docs build dependencies.
.gitignore	Removes ignore rules for pyproject.toml and uv.lock.
.github/workflows/deploy-docs.yml	Switches docs dependency install to requirements.txt and updates pip cache dependency path.

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