Improved 404 handling and fixed editor error

404 handling now not a hack-around and uses Laravel 'fallback' routes
instead. Prevents errors with the session when you have mulitple errors
on a page where a post/put/delete is made.

app/Http/Kernel.php

@@ -33,14 +33,6 @@ class Kernel extends HttpKernel
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
             \BookStack\Http\Middleware\Localization::class
         ],
-        'web_errors' => [
-            \BookStack\Http\Middleware\EncryptCookies::class,
-            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
-            \Illuminate\Session\Middleware\StartSession::class,
-            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
-            \BookStack\Http\Middleware\VerifyCsrfToken::class,
-            \BookStack\Http\Middleware\Localization::class
-        ],
         'api' => [
             'throttle:60,1',
             'bindings',