Chore: Move built docs from Git repository

[krmax44]

At the moment the built docs are tracked in the Git repo to be served by Github pages. This isn't ideal as it's cluttering up commits and the repo should only contain the source files. A couple of ways to solve this:

• Use a CI/CD like Gitlab Pages, Netlify or (at the moment only a very hacky solution is available) Github Actions
• use npm module gh-pages to build locally and push to the pages branch. Drawback: no deploy previews, not automated, messy.

[ndabAP]

Totally agree. I guess I'll make it part of #100. If not, I'll do afterwards.