gnu-social/public/theme

* To use a theme other than neo, add this to config.php:
$config['site']['theme'] = 'yourthemename';

* To use/import the base theme, add this to your theme.ini file:
include=base

* To include an external CSS resource (e.g. for a webfont), add this to the top of your theme.ini file:
external[]="yourexternalURL"