Allow customising image title generation prompt in Prompt model #83
Description
For the initial release of AI image title generation we have chosen to allow customisation of the prompt in Django settings.
It would be nice for consistency if this was customisable from within the Wagtail admin, in our Prompt model used for rich-text prompts.
This might involve:
- Adding a new field to Prompt to specify what 'feature' the prompt can be used for
- Updating the image alt text UI so that multiple prompts can be selected from if the user has created more than one prompt for the same feature