Remove some pdoc remnants

[nrichers]

Internal Notes for Reviewers

This PR:

• Fixes a workflow issue related to the removal of the pdoc files
• Removes CSS and HTML Jinja2 template for pdoc

External Release Notes

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[github-actions]

PR Summary

This pull request introduces two main changes:

1. Enhancement to GitHub Actions Workflow:

   • The quarto-docs.yaml workflow file has been updated to include a token parameter for the actions/checkout@v4 step. This change uses the GH_TOKEN secret to authenticate the checkout process, which can help in accessing private repositories or increasing the API rate limit.

2. Removal of Unused Documentation Templates:

   • The custom.css and module.html.jinja2 files have been removed from the docs/templates directory. These files were likely unused or redundant, and their removal helps in cleaning up the project structure.

These changes aim to improve the security and maintainability of the project by enhancing the CI/CD pipeline and removing unnecessary files.

Test Suggestions

• Verify that the GitHub Actions workflow runs successfully with the new token configuration.
• Check if the documentation generation process still works as expected without the removed templates.
• Ensure that no other parts of the project depend on the removed custom.css and module.html.jinja2 files.