website/docs: update create oauth provider page (cherry-pick #16617)

[authentik-automation]

Cherry-pick of #16617 to version-2025.8 branch.

Original PR: #16617
Original Author: @dewi-tik
Cherry-picked commit: 87b9276

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✅ Deploy Preview for authentik-integrations ready!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.80%. Comparing base (19b672b) to head (ea464e7).
⚠️ Report is 1 commits behind head on version-2025.8.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                Coverage Diff                 @@
##           version-2025.8   #16806      +/-   ##
==================================================
+ Coverage           92.75%   92.80%   +0.05%     
==================================================
  Files                 837      837              
  Lines               45325    45325              
==================================================
+ Hits                42042    42065      +23     
+ Misses               3283     3260      -23     

Flag	Coverage Δ
e2e	46.55% <ø> (+0.07%)	⬆️
integration	23.54% <ø> (+<0.01%)	⬆️
unit	90.90% <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-ea464e78ecfec6e75bedaced9225f90bc4dd71c1
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-ea464e78ecfec6e75bedaced9225f90bc4dd71c1

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