In which we restructure the frontend and add some semblance of a README.

This pull request is pretty crucial to the frontend. In here, I've:

* Added a frontend README! Finally. This README includes a great deal of information on the project itself (or, well, the frontend piece of it), the technologies we're using and abusing, how to get started & contribute, the file structure, and other important notes. This can (and will) be improved as we go along, but for now, it's a nice starting point.

* Restructured the frontend. Namely, I've moved all the files we'll need to serve to the frontend (all of our JS, partials, CSS, and vendor files, mainly) to the /static subfolder. This allows us to actually call the files, and use them in the development of the app. Kinda important, natch.

* Removed the outer-level index.html, and integrated our code into the app.html/index.html files in the /templates directory. This may get restructured again at some point, but for now, this is perfectly acceptable. As long as our files get served from somewhere else, we're perfect.

* Accidentally deleted whitespace at the end of the .dev_env file. I'm betting this isn't an issue. But worth noting.

* Gitignored all the .idea files that come with JetBrains products (IntelliJ, PHPStorm [personal fave], WebStorm, etc.). Also, you can see the remnants of where I ignored my .dev_env file temporarily. (Helps keeps committing easy.)

That's about it. Obviously if you have any questions, feel free to ask!

--Maia
I think you should care about whether the person uses 4 space tabs or not.  A codebase where basic style things are inconsistent is really no fun to work with.  So, if one person uses 4 spaces and another uses 2, do you change your editor's tab configuration depending on whose files you're editing, or do you just do whatever you want and have really inconsistent looking code?

A codebase written by four people that looks like it was written by one person is much more fun to work with than a codebase written by four people that looks like it was written by four people.