- Update `generate-readme.yml` to use Python scripts. Previously it was
awk scripts.
- Rename python script to `generate_readme`. Previously it was called
`main.py`.
- Add note to `CONTRIBUTING.md` explaining the new file to add
manual entries.
- Fix typo in `CONTRIBUTING.md`.
- Add `generate-readme.yml` workflow to update `README.md` on pushes to `main` when `_README.md` changes
- Introduce AWK scripts as a submodule (`scripts/awk`) for processing the README
- Rename `README.md` to `_README.md` to serve as the source file