[Suggestion] Allow users to change LRR's plug-in settings before the initial scan

[Asinin3]

If people could configure LRR to how they wanted it set-up before LRR goes through and scans all their files, It would really help stop people running into a lot of issues and using the batch-tagger after-the-fact. Alternatively, these files could still be added, but the auto-tagger wouldn't run on the new files until a user goes through and configures LRR

Then just add a big "Initial Scan" button on the index page that appears for new users perhaps with some text saying to check that the plugin settings and tag blacklist is set to their liking before they run the scan.

Currently new users that already have a bunch of galleries are installing LRR, pointing it to their library, and then have to go back and re-run the batch tagger because it didn't use the plug-ins or blacklist settings they wanted.

[Difegue]

From a design perspective this is actually pretty easy : Just don't start the background worker immediately for first-timers. Starting it after boot can be done using the existing API endpoints.

The main workload here is designing a proper, understandable out-of-the-box user experience: Adding a popup on the index to inform the user could work, I guess?