Nth PR on develop branch for easybuild-docs, for N=5

still bits and pieces to improve, but ok to receive the first round of feedback
maybe make it clear that the example out here is for EasyBuild v1.15.2, that way we don't have to update it (and the manual changes won't need to be done again)

otherwise: move the output to `version-specific` dir, in which the blobs of text will be updated as part of a new release via a script