chore: update docs again

[lily-de]

I had to move:

• docs out of docs/docs

• mkdocs.yaml into the root directory

  1. Documentation Changes:
     • Generated new reference pages via the script docs/scripts/gen_ref_pages.py.
  2. Assets and Configuration:
     • Modified .gitignore to exclude new documentation-related entries.
     • Added a .nojekyll file for GitHub Pages configuration.
     • Updated mkdocs.yml to incorporate new documentation changes and configurations.
  3. Build & Deployment Configuration:
     • Added a new GitHub Workflow file .github/workflows/deploy_docs.yaml for automating the deployment process of documentation.
     • Updated project root configurations in justfile and pyproject.toml