Removed throttling from web-end requests

Generally seems to cause issues when secure images are in use.
Was added during laravel upgrade but laravel does not use this directly
for its web middleware anyway.

app/Http/Kernel.php

@@ -26,7 +26,6 @@ class Kernel extends HttpKernel
             \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
             \Illuminate\Session\Middleware\StartSession::class,
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
-            \Illuminate\Routing\Middleware\ThrottleRequests::class,
             \BookStack\Http\Middleware\VerifyCsrfToken::class,
             \BookStack\Http\Middleware\Localization::class,
             \BookStack\Http\Middleware\GlobalViewData::class,