Ember - donation system, bans, loading screen & landing/index page

1. Added Arma 3 support for server cards
2. Added a favicon setting
3. Added an optional custom sign in button
4. Bug fixes & improvements

Files modified:

1. web/app/Controllers/PagesController.php
2. web/app/Models/Server.php
3. web/bootstrap/app.php
4. web/public/img/ember.ico
5. web/public/js/forms.js
6. web/resources/lang/en.php
7. web/resources/views/admin/misc.twig
8. web/resources/views/admin/servers.twig
9. web/resources/views/layouts/navbar.twig
10. web/resources/views/templates/app.twig