website/docs: Update ArgoCD integration docs.

[Gunsmithy]

Details

Updated the ArgoCD integration documentation, primarly to add an example Terraform implementation similar to the one found in the Grafana integration docs. (Lost some time to the lack of this since I didn't know the UI defaults to having the email, openid and profile scopes when creating a new provider.)

Added an extra pointer for how to modify the ArgoCD secret when deployed with Helm, and how to add Readonly users to Argo.

Also made the opinionated change of replacing most HTTP schemes with HTTPS where they should realistically be used. :)

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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

• [X] The documentation has been updated
• [X] The documentation has been formatted (make website)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.36%. Comparing base (09cacbd) to head (1b15644). Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9684      +/-   ##
==========================================
- Coverage   92.39%   92.36%   -0.03%     
==========================================
  Files         704      704              
  Lines       34401    34403       +2     
==========================================
- Hits        31785    31778       -7     
- Misses       2616     2625       +9     

Flag	Coverage Δ
e2e	49.65% <ø> (-0.01%)	:arrow_down:
integration	25.36% <ø> (-0.02%)	:arrow_down:
unit	89.82% <ø> (+<0.01%)	:arrow_up:

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