Create Komga index.md

Created OIDC SSO settings for Komga

Signed-off-by: Avsynthe <102600593+Avsynthe@users.noreply.github.com>

website/integrations/services/komga/index.md

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+---
+title: Komga
+---
+
+<span class="badge badge--secondary">Support level: Community</span>
+
+## What is Komga
+
+From https://komga.org/
+
+:::note
+Komga is a free and open source comics/mangas media server
+:::
+
+## Preparation
+
+The following placeholders will be used:
+
+-   `komga.company` is the FQDN of the Komga install.
+-   `authentik.company` is the FQDN of the authentik install.
+
+Create an application in authentik. Create an OAuth2/OpenID provider with the following parameters:
+
+-   Client Type: Confidential
+-   Scopes: OpenID, Email and Profile
+-   Signing Key: Select any available key
+-   Redirect URIs: https://komga.company/login/oauth2/code/authentik
+
+Note the Client ID and Client Secret values. Create an application, using the provider you've created above. Note the slug of the application you've created.
+
+## Komga
+
+Add the following block to your Komga application.yml. If this does not exist, you must create it.
+
+:::info
+For more info, see https://komga.org/installation/oauth2.html#advanced-configuration
+:::
+
+```yaml
+komga:
+  ## Comment if you don't want automatic account creation.
+  oauth2-account-creation: true
+spring:
+  security:
+    oauth2:
+      client:
+        registration:
+          authentik:
+            client-id: 'client-id'
+            client-secret: 'client-secret'
+            client-name: client-name
+            scope: openid,profile,email
+            authorization-grant-type: authorization_code
+            redirect-uri: "https://komga.company/login/oauth2/code/authentik"
+        provider:
+          authentik:
+            issuer-uri: https://authentik.company/application/o/app-slug/
+            user-name-attribute: preferred_username
+```