`service.css` was updated to remove of disable unnecessary links from the top
menu to remove the possibility to navigate away from the Talk app:
- disable Nextcloud logo, Talk and settings link;
- remove "More" and contacts link.

Source: https://github.com/getferdi/recipes/tree/master/uncompressed/nextcloud-talk

This may be Ferdi specific though.
This was the error when packaging the recipe for Ferdi:

Could not add your recipe: There were errors in your package.json:

Your package.json contains a 'config' object with no 'serviceURL' field.
This field should contain the URL of your service.
For more information about the package.json file visit 
https://github.com/getferdi/recipes/blob/master/docs/configuration.md

`service.css` was updated to:

- unhide contacts menu;
- hide notifications that are not related to Nextcloud Talk;
- hide "Dismiss all notifications" as this action would also dismiss hidden
  notifications.

`webview.js` was updated to fix notifications (both direct and indirect) count
retrieval.

`webview.js` was updated to get direct notifications count only when
notification wrapper has been loaded.