* [x] edit pages
* [x] hugo-test -> final location
* [x] auto-build
* [x] auto-publish
* [x] solve git issue with symlink
* [x] pb with working-directory
* [x] remove book.json
* [x] fork-me widget
* [x] reword: about
* [x] reword: install
* [x] reword: contributing
* [x] reword: usage
* [] spare CI when only docs is updated
* [] versioning docs? tree for tagged releases
* [] visualize HTML on PR? -> preview needs something like netlify (alpha feature on github pages)
* [] document how to build docs locally
