website/docs: add missing notification rule example doc to sidebar (cherry-pick #16478)

[authentik-automation]

Cherry-pick of #16478 to version-2025.8 branch.

Original PR: #16478
Original Author: @dewi-tik
Cherry-picked commit: dbb9810

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.82%. Comparing base (ab6b9b2) to head (7061c26).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                Coverage Diff                 @@
##           version-2025.8   #16479      +/-   ##
==================================================
+ Coverage           92.77%   92.82%   +0.05%     
==================================================
  Files                 837      837              
  Lines               45259    45259              
==================================================
+ Hits                41988    42011      +23     
+ Misses               3271     3248      -23     

Flag	Coverage Δ
e2e	46.60% <ø> (+0.07%)	⬆️
integration	23.56% <ø> (+<0.01%)	⬆️
unit	90.91% <ø> (+<0.01%)	⬆️

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[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-7061c26adee4748ee6982eb367532e57c93274af
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-7061c26adee4748ee6982eb367532e57c93274af

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