move docs repo in here

[lukemarsden]

The docs repo at https://github.com/SAME-Project/SAME-Docs should be in the monorepo, so that docs changes can be included alongside code changes in PRs.

• [x] copy the docs in
• [x] archive the docs repo with a note in the readme pointing here

[js-ts]

@lukemarsden can you add https://github.com/SAME-Project/SAME-installer-website to the repos to be archived along with docs