Help editors to generate a site briefing

Problem/Motivation

We noticed that a lot of people are struggling to write a page briefing, for that reason, we implemented a AI solution for this.

Proposed resolution

Add a button "Generate site briefing draft", in the sidekick admin configuration page.
A user can input there (after click) a URL and the API will generate a draft. This can already be found at https://assistant.ai-sidekick.app/chat/account-context/edit, but as we moved the edit page into Drupal, we have to take care of that in the config page.

Remaining tasks

User interface changes

Add "Generate site briefing draft" button on the config page