issue2550966: fix suboptimal links in docs. I think I got the majority of them. Some links still don't resolve because they are gone and there is no replacement afaict. Also the check is picking up example links like: https://.../rest and http://localhost:8017/... which should not be checked but are.

@rem python -m pip install sphinx
@rem python -m pip install sphinxcontrib-cheeseshop

python -m sphinx . html