move docs to github/docs

[pvgenuchten]

in stead of running it as a service, let git-action deploy as html on geonovum.github.io/ogc-api-testbed/docs

By @justb4:

Yes, in addition it is quite easy to run "docs" as a GitHub Pages flat HTML website in its own domain. We use this e.g. for pygeoapi.io and tv.osgeo.nl . So this needs to be done:

• [x] move docs from services/docs to GH root /docs
• [x] make new service "home" that is just a one-page index.md landing page with links to the services and the new docs site, make required Ansible and Actions changes
• [x] DNS: create a CNAME entry e.g. apitestdocs.geonovum.nl that refers to geonovum.github.io
• [x] GitHub create GH Pages entry with CNAME
• [x] GitHub add GH Action file to publish docs to GitHub, use pygeoapi.io main.yml as starter
• [x] anything else? See https://github.com/geopython/pygeoapi.io

Advantages:

• docs are always available even when VPS-es gone
• single authoritative place for documentation (i.s.o. both in stable and sandbox servers)

[thijsbrentjens]

good proposal, I'll asl for a CNAME entry

[thijsbrentjens]

CNAME entry should be there: apitestdocs.geonovum.nl --> geonovum.github.io

[justb4]

done