GitHub Actions workflow for release

[herve4m]

Fixes #3 by adding the release.yml GitHub action workflow, which is triggered when a new release is published in GitHub.
This workflow uses the redhat-cop/ansible_collections_tooling/.github/workflows/release.yml COP workflow.

The workflow requires an Ansible Galaxy API key to declare in the repository settings, which is not set (and therefore the workflow does not work)
Someone with permissions to the infra namespace in Ansible Galaxy can create such a key.

Also, the Sphinx documentation for the collection is removed from the repository, and therefore the version issue is resolved.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
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  Coverage        ?   82.76%           
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  Files           ?       24           
  Lines           ?     1863           
  Branches        ?      456           
=======================================
  Hits            ?     1542           
  Misses          ?      192           
  Partials        ?      129           

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[Tompage1994]

LGTM. I've reached out to try to find the key

Apologies for the slow approval, I've been away and then never followed up