Add Builder canvas styles example:

'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css',
'{{ 'assets/css/vendor.css' | theme }}'

Add Builder canvas scripts example:

'https://code.jquery.com/jquery-3.2.1.slim.min.js',
'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js',
'{{ 'assets/js/main.js' | theme }}'