website/docs: add icon info to style guide (cherry-pick #18832 to version-2025.10)

[authentik-automation]

Cherry-pick of #18832 to version-2025.10 branch.

Original PR: #18832
Original Author: @dewi-tik
Cherry-picked commit: 2818b0b

[netlify]

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✅ Deploy Preview for authentik-integrations canceled.

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🔨 Latest commit	2825ebc
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.92%. Comparing base (50b291d) to head (2825ebc).
⚠️ Report is 1 commits behind head on version-2025.10.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           version-2025.10   #18834      +/-   ##
===================================================
- Coverage            92.95%   92.92%   -0.03%     
===================================================
  Files                  869      869              
  Lines                48161    48161              
===================================================
- Hits                 44767    44756      -11     
- Misses                3394     3405      +11     

Flag	Coverage Δ
e2e	45.12% <ø> (+0.01%)	⬆️
integration	23.17% <ø> (+<0.01%)	⬆️
unit	91.06% <ø> (+<0.01%)	⬆️
unit-migrate	91.11% <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-2825ebcc7c9b630cbdd34521e4bf3f552e11ad2a
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-2825ebcc7c9b630cbdd34521e4bf3f552e11ad2a

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