Documentation is now published on the `gh-pages` branch.
The branch will have a folder `docs` containing the following structure:
- `./docs` the copy from the `main` docs, but only used for the `index.html` page to do the multi-version routing.
- `./docs/main` the copy from the `main` branch docs folder
- `./docs/beta` the copy from the `beta` branch docs folder
Closes#332
