There's a thousand ways to do this, but this would be easiest to explain:
1. Go to this file and after this line
https://github.com/nabeelio/phpvms/blob/dev/app/Http/Controllers/Frontend/HomeController.php#L16
Put this
User::find(1)->attachRole('admin');
2. Go to your home page (http://siteurl.com/) and refresh the page and it should be there again.
3. Remove the line of code
This is assuming you are User number 1 in your database (id of 1 in the users table). There are other ways to do it such as putting it in the routes file, editing the database tables (but not recommended as it adds it into a few), using the Auth::user() instead once you are logged in.