refactor: revamp devtools page

This commit refactors the development tools page to make it look better. Additionally, it makes small adjustments in the notifications and corrects missing strings from the page.

app/Notifications/AbsenceRequestDeclined.php

@@ -49,7 +49,6 @@ class AbsenceRequestDeclined extends Notification implements ShouldQueue
                 ->subject(config('app.name').' - absence request declined')
                 ->line("Your recent Leave of Absence request from {$this->absence->created_at} has just been declined by an admin.")
                 ->line('Please note that any inactivity will be counted in our activity metrics. You may make a new request, but we recommend you ask your team lead regarding your declined request.')
-                ->action('View your request', url(route('absences.show', ['absence' => $this->absence->id])))
                 ->action('Send new request', url(route('absences.create')))
                 ->salutation('The team at ' . config('app.name'));
     }