Gulp and Bower are required to manage assets.

First, you will need to install NodeJS.

Install gulp and bower with the following from the command line. On some setups, sudo may be required.

npm install -g gulp bower

From the fett theme directory, enter the following in the command line. This will pull in the component assets for Fett. These are referenced includes from the KAST theme for you - no need to copy them into the KAST/subthemes.

bower install

Create a subtheme. See the Build a theme with Drush section below on how to do that.

It is highly encouraged to use Drush to generate a sub theme for editing. Do not edit the parent 'fett' theme! Enter the following drush command:

 drush fett [THEMENAME] [Description !Optional]

See the subtheme README.md for further instructions.