docs: List DJANGOCMS_VERSIONING_LOCK_VERSIONS in settings

[fsbraun]

Description

This PR updates the docs , specifically explicitly lists the DJANGOCMS_VERSIONING_LOCK_VERSIONS settings in settings.rst.

It also introduces a github action that builds the docs.

Related resources

• #...
• #...

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e6e3143) 90.93% compared to head (187c8ef) 90.93%.

❗ Current head 187c8ef differs from pull request most recent head e1096af. Consider uploading reports for the commit e1096af to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #350   +/-   ##
=======================================
  Coverage   90.93%   90.93%           
=======================================
  Files          72       72           
  Lines        2536     2536           
  Branches      357      357           
=======================================
  Hits         2306     2306           
  Misses        170      170           
  Partials       60       60           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.