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Install NodeJS then run the following in root of the source tree.
$ npm install
This will read the package.json file and install the required
dependencies locally into a node_modules folder.
Run the following in the root of the source tree.
$ grunt preview
This will launch a mini webserver hosting the generated content which you can use to test your changes. It will automatically regenerate the pages when you modify files so you don't need to start/stop this when you change source files.
The URL is http://localhost:8080/2015/index.html.
Run the following in the root of the source tree.
$ grunt deploy