website/docs: Update Docusaurus config. Prep for version picker.

[GirlBossRush]

Details

This PR updates the docs package in preparation for the monorepo branch. The changes applied are primarily linter and formatter fixes, with some additional type checking applied.

Also included is some partial improvements to the version dropdown's copy, clarifying our current default of showing docs planned for the next release of authentik.

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 92.71%. Comparing base (264f597) to head (6533d50).
Report is 9 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14401      +/-   ##
==========================================
- Coverage   92.78%   92.71%   -0.07%     
==========================================
  Files         809      809              
  Lines       41533    41533              
==========================================
- Hits        38536    38507      -29     
- Misses       2997     3026      +29     

Flag	Coverage Δ
e2e	47.82% <ø> (-0.09%)	⬇️
integration	24.39% <ø> (ø)
unit	90.57% <ø> (ø)

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[tanberry]

Approving for ease and speed of getting other coupled PR going.

[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-6533d50de620a44b3c523a74fde5e0d4dd8ee9ef
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-6533d50de620a44b3c523a74fde5e0d4dd8ee9ef

Afterwards, run the upgrade commands from the latest release notes.