Doxygen for API documentation

[philippeverley]

Set-up the documentation skeleton with Doxygen.

Trigger Doxygen generation with Github Actions on push to main

[philippeverley]

For GA, something like that?

name: Deploy Documentation
on:
  push:
    branches: [ main ]
jobs:
  build-docs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Doxygen
        run: sudo apt-get install doxygen graphviz
      - name: Generate Docs
        run: doxygen Doxyfile
      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./docs/html