First of all you need to have Ruby installed (we recommended the latest version). In the Jekyll site you can find instructions to install Ruby in your machine.
With Ruby installed follow these steps to run Guru SP in your machine:
gem install jekyll bundlerbundle installbundle exec jekyll serve
Now the Guru SP must be running at http://127.0.0.1:4000/. When you need to run the local server again just run bundle exec jekyll serve
You can contribute submitting pull requests.