Setup and migration UI refactor (#1190)

* Make config instance-based
* Remove config dependency in paths
* Refactor config init
* Allow startup without database
* Get system status at UI initialise
* Add setup wizard
* Cache and Metadata optional. Database mandatory
* Handle metadata not set during full import/export
* Add links
* Remove config check middleware
* Stash not mandatory
* Panic on missing mandatory config fields
* Redirect setup to main page if setup not required
* Add migration UI
* Remove unused stuff
* Move UI initialisation into App
* Don't create metadata paths on RefreshConfig
* Add folder selector for generated in setup
* Env variable to set and create config file.
Make docker images use a fixed config file.
* Set config file during setup

pkg/api/resolver_query_scraper.go

@@ -89,7 +89,7 @@ func (r *queryResolver) ScrapeMovieURL(ctx context.Context, url string) (*models
 }
 
 func (r *queryResolver) QueryStashBoxScene(ctx context.Context, input models.StashBoxQueryInput) ([]*models.ScrapedScene, error) {
-	boxes := config.GetStashBoxes()
+	boxes := config.GetInstance().GetStashBoxes()
 
 	if input.StashBoxIndex < 0 || input.StashBoxIndex >= len(boxes) {
 		return nil, fmt.Errorf("invalid stash_box_index %d", input.StashBoxIndex)