Performance improvements #602 (#607)

* Update gitignore

* Save theme to the session to avoid a lookup #602

* Formatting

* Move routes into main service provider

* Move Observers into their own service provider

config/app.php

@@ -82,6 +82,7 @@ return [
         App\Providers\DirectiveServiceProvider::class,
         App\Providers\EventServiceProvider::class,
         App\Providers\MeasurementsProvider::class,
+        App\Providers\ObserverServiceProviders::class,
         App\Providers\RouteServiceProvider::class,
     ],