Start using GeneratedField for Documents #1650
Description
The Document models have a JSON field with the data generated by Sphinx.
At the moment we use it only to read some value and populate the SearchVectorField used to perform the full-text search.
We can transform this field into a GeneratedField so that the database updates it automatically without needing to run a command.
In addition to that we can create other GeneratedFields to use them directly in the page rendering.
This issue is blocked by others:
- finally switch to Python 3.12
- update to Django 5.x