Added option to create and edit recipes in the browser

[RobinWeitzel]

Uses the Github API to commit new or changed recipes to the repository.
This makes it possible to create and edit recipes without having to open a text editor every time.

A few caveats:

• Unfortunately, Githubs CORS policy on OAuth requests makes it impossible to use OAuth for authentication.
• After updating a file, it takes a few minutes for Github to rebuild the site so changes are not immediately visible.
• Does not work with component recipes

[PhilipNelson5]

what does this caveat mean for usability?

Unfortunately, Githubs CORS policy on OAuth requests makes it impossible to use OAuth for authentication.

[RobinWeitzel]

It means, you have to log in to Github every time you make an edit. I can't request a token from Github to keep the user logged in (without using a third party service which I want to avoid).

For me personally, I usually only add one recipie at a time so in that case it does not matter but if you want to add multiple recipies right after each other it's extra hassle.