In order to develop the theme you need the Grunt command line tool, which can be easily installed via npm:
$ npm install -g grunt-cli
Then go to the theme folder src/wise/theme/theme/ and install the theme dependencies:
$ cd src/wise/theme/theme/ $ npm install
After executing these commands you can run grunt to watch for any less changes:
$ grunt watch
This will make sure that the many .less files are compiled to .css on the fly and then served up from the theme.
For development mode, run:
$ grunt development
For production mode, run:
$ grunt production
See rules.xml for the relevant Diazo rules.
If you prefer to do a one time compile of the less files you can run:
$ grunt less