Search function for theme settings

[candidexmedia]

Hi Publii team!

When testing themes, I sometimes struggle to figure out where in the tabs the setting I'm looking for is (or if what I'm looking for even exists as a setting). I know that I can simply consult the config.json file, but it would be great to eliminate the guess work, and jump to the setting quickly. Since internal linking between options is already possible, I would love to see this as a next step.

This could look like a search bar, or a command palette (the command palette could also handle other actions like quickly creating pages/posts, jumping to the Custom HTML editor, making a backup, etc.)

[michaelfluegge]

and, as an addition, from my point of view it would be very helpful to have the standard settings available. E.g. when changing the page margin, Entry with or whatever, it would be helpful if write the standard string beside the field. Or if one empty the field, the standard setting appears. or anything similar