Contributions could hit the site more easily by removing the master branch

[jrsconfitto]

After sending a PR, i realized that my changes wouldn't make it over to the tutorial site because i sent the patch against the master branch instead of the gh-pages branch.

i would suggest getting rid of the master branch because this project can just work off the gh-pages branch and the site would be unaffected. i think it will grease the skids for future contributors/contributions.