Docs: Update REST documentation and mkdocs

README.md

@@ -21,12 +21,12 @@ Deck is a kanban style organization tool aimed at personal planning and project
 
 ![Deck - Manage cards on your board](http://download.bitgrid.net/nextcloud/deck/screenshots/1.0/Deck-2.png)
 
-### Mobile apps
+## Mobile apps
 
 - [Nextcloud Deck app for Android](https://github.com/stefan-niedermann/nextcloud-deck) - It is available in [F-Droid](https://f-droid.org/de/packages/it.niedermann.nextcloud.deck/) and the [Google Play Store](https://play.google.com/store/apps/details?id=it.niedermann.nextcloud.deck.play)
 - [Nextcloud Deck app for iOS](https://github.com/StCyr/deck-react-native) - It is available in [Apple App store](https://apps.apple.com/ml/app/nextcloud-deck/id1570892788)
 
-### 3rd-Party Integrations
+## 3rd-Party Integrations
 
 - [trello-to-deck](https://github.com/maxammann/trello-to-deck) - Migrates cards from Trello
 - [mail2deck](https://github.com/newroco/mail2deck) - Provides an "email in" solution