Add link to Jekit source code in index.html

[daguar]

Was looking around for this and noticed the repo's not called Jekit; if I had a bit of trouble finding it I imagine others might too, so adding a link to the repo into the project overview page.

[migurski]

Thanks—might take me a bit of time to deploy, need to get this and other tools into a better, more chef-driven state so deployment is less mysterious.