This commit switches the route for the about config page to retrieve the list of site settings that control the /about page by their area instead of their individual names.
Internal topic: t/136384.
This commit adds a new "Community title" field to the about config page. This field controls the `short_site_description` setting, which is shown in the browser tab for key pages such categories pages and topic lists.
Internal topic: t/140812.
Followup 4aea12fdcb
In certain config areas (like About) we want to be able
to fetch specific site settings by name. In this case,
sometimes we need to be able to fetch hidden settings,
in cases where a config area is still experimental.
Splitting out a different endpoint for this purpose
allows us to be stricter with what we return for config
areas without affecting the main site settings UI, revealing
hidden settings before they are ready.
This commit continues work laid out by ffec8163b0 for the admin config page for the /about page. The last commit set up the user interface, and this one sets up all the wiring needed to make the input fields and save buttons actually work.
Internal topic: t/128544.
