update(chore): bump minimal version of Material for Mkdocs and fix related bugs

[Guts]

• since Material for Mkdocs turned into maintenance mode, all insiders features are available, so this PR remove code related to split feature between community/insiders editions
• fix AttributeError: 'MkdocsPageSubset' object has no attribute 'file'. Did you mean: 'title'? #404
• improve integrations with Material theme

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.87%. Comparing base (b7bd81b) to head (7dc6646).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...lugin/integrations/theme_material_social_plugin.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   80.23%   83.87%   +3.64%     
==========================================
  Files          11       11              
  Lines         779      763      -16     
  Branches      130      127       -3     
==========================================
+ Hits          625      640      +15     
+ Misses        112       81      -31     
  Partials       42       42              

Flag	Coverage Δ
unittests	83.87% <88.23%> (+3.64%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ocs_rss_plugin/integrations/theme_material_base.py	88.88% <ø> (+8.88%)	⬆️
..._plugin/integrations/theme_material_blog_plugin.py	79.66% <100.00%> (+2.73%)	⬆️
...lugin/integrations/theme_material_social_plugin.py	88.39% <71.42%> (+17.66%)	⬆️

... and 1 file with indirect coverage changes

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