Adding storage class, changing profile header, updating about page

## Enhancements
 - New about page content
 - Make usernames fit on profile #177
 - Make storage class for all sql, improve error messages #179
 - Create 'includes' folder and put pagination.php, storage.php inside
 - includes/.htaccess deny viewing includes folder
 - .htaccess deny access to config.php
 - Add error for user not found on search #169