Move tutorials to relevant repos
Tutorials hosted here can get outdated in two ways
- becoming irrelvant (when based on tag)
- becoming broken when not (e.g. https://ftag.docs.cern.ch/software/tutorials/tutorial-tdd/ - thanks to @wlai for reporting this one)
It might be easier to move tutorials in their respective repos, and just link to them from these documentation pages.
(also someone should update the dumpster tutorial)