docs: convert documentation to markdown
Description
This changes out the doc generator command and converts back to the markdown equivalents. It also removes some of the Sphinx build items that are no longer needed as we transition the docs away from ReadtheDocs.
If you review this with gitlab-docs!3152 (closed) in mind - it starts to make sense how moving to Markdown and then just putting the docs in the main GitLab Documentation site would work together.
Related Issues
Resolves #1010 (closed)
How has this been tested?
Screenshots (if appropriate):
Types of changes
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Bug fix (non-breaking change which fixes an issue) -
New feature (non-breaking change which adds functionality) -
Breaking change (fix or feature that would cause existing functionality to change) -
Documentation -
Chore (Related to CI or Packaging to platforms)
Edited by Kai Armstrong