Develop for WET/Github guide page

@thomasgohard 
This is the last PR for the proposal of a new page that involves everything in "developing for WET". Currently, there are pieces of information on how to develop for WET all over the site that I think should be on one page. Feel free to use it or make some changes to it, but I do believe there needs to be a guide to aid users in developing/using Github. Also, having "Guides" would be ideal in the near future as testers have mentioned that they like this idea in our last usability testing. Here's our version regarding "Guides" if you're interested: http://burgvan.github.io/wet-boew-student-project/dist/unmin/docs/webguides-en.html




This heading is inaccurate: The instructions below are only for creating a new theme.