[FR] Ability to disable AI features entirely

[chevdor]

Description

AI is great and all but it remains optionnal and it is great this way.
However, even if the afc-ai container is not started, even if the ai ENV are not set, the editor still shows lots trace of AI features that will definitely not be working.

To give a few examples:

All of those bloat the nice UI with items that cannot work and will not work (because of the lack of API tokens, or les lack of credits being those API tokens).

Impact

• UI/UX Bloat.
• Confusing "not working" functions for less tech savy user
• Some people just do NOT want AI features

Additional Context

If APPFLOWY_AI_SERVER_HOST is not set, it is very unlikely that AI will work.
However using this ENV and the lack of content (or any other way), to cleanup the UI from AI :)