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/AbsenceRequestEnded.php

@@ -49,7 +49,6 @@ class AbsenceRequestEnded extends Notification implements ShouldQueue
                 ->subject(config('app.name').' - absence request expired')
                 ->line("Your Leave of Absence request from {$this->absence->created_at} (until {$this->absence->predicted_end}) has expired today.")
                 ->line('Please note that any inactivity will be counted in our activity metrics. You may now make a new request if you still need more time.')
-                ->action('View expired request', url(route('absences.show', ['absence' => $this->absence->id])))
                 ->action('Send new request', url(route('absences.create')))
                 ->salutation('The team at ' . config('app.name'));
     }