Add section numbering in OpenQA Documentation

[Wabri]

related: https://progress.opensuse.org/issues/90341

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching docs/*.asciidoc:

• Consider generating documentation locally to verify it is rendered correctly. See https://open.qa/docs/#_making_documentation_changes

This is an automatically generated QA checklist based on modified files.

[okurz]

Fixing issues by removing stuff. I love it! :D

[okurz]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (3e2b43d) to head (cc38a72).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6301   +/-   ##
=======================================
  Coverage   99.03%   99.04%           
=======================================
  Files         398      398           
  Lines       40034    40034           
=======================================
+ Hits        39649    39650    +1     
+ Misses        385      384    -1     

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