website/docs: refactor pip to pipx on linux and improve styling

[ImmanuelVonNeumann]

Details

When setting up a local authentik-install on Ubuntu 24.04 using the documentation provided command pip install poetry poetry-plugin-shell will fail with error error: externally-managed-environment due to PEP 668.

It is generally understood that pipx should be used in place of pip due to security concerns.
To keep the documentation in line with modern practices, I changed the documentation to use pipx in place of pip for linux.

Maybe the same should be done for the mac tab-item.
If so, please let me know.

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.74%. Comparing base (4068d67) to head (33d1d4a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13506      +/-   ##
==========================================
+ Coverage   92.68%   92.74%   +0.05%     
==========================================
  Files         794      794              
  Lines       40419    40419              
==========================================
+ Hits        37461    37485      +24     
+ Misses       2958     2934      -24     

Flag	Coverage Δ
e2e	47.93% <ø> (+0.08%)	⬆️
integration	24.07% <ø> (ø)
unit	90.51% <ø> (+<0.01%)	⬆️

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