website/docs: Flesh out Google Workspaces SAML.

[GirlBossRush]

Details

This pull request documents how to integrate Google Workspaces into authentik as a SAML identity provider.

Closes #5035

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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 92.76%. Comparing base (3253de7) to head (491392d).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12701      +/-   ##
==========================================
- Coverage   92.77%   92.76%   -0.02%     
==========================================
  Files         769      769              
  Lines       38909    38912       +3     
==========================================
- Hits        36098    36095       -3     
- Misses       2811     2817       +6     

Flag	Coverage Δ
e2e	48.57% <ø> (-0.06%)	⬇️
integration	24.62% <ø> (+<0.01%)	⬆️
unit	90.40% <ø> (-0.01%)	⬇️

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[tanberry]

Thanks so much @GirlBossRush for this new doc! Apologies there are so very many edits; don't be daunted, they are mostly Style Guide adherence things, and you can click Accept suggestion and move through most of them quickly. Thank you also for introducing some new ways of presenting info, and the friendly tone.