Exploring some style changes

[anaximander]

This is kind of a hodgepodge mix of stuff. Some notable changes include:

• Downloaded fontawesome css + google fonts so they can be served without adding a network-bound dependency, and also to preserve the privacy of users.
• Added missing dependencies (axios, react, react-dom, dev: react-scripts)
• (Lossily) compressed wine glass "spinner" gif to ~650kb (from ~1MB)
• Added more defaults and stricter validations on bottle form.
• Updated styles here and there (feel free to keep all/any/none, I was just experimenting).
• Moved BottleFilter into Bottle component (since it seemed BottleFilter wasn't generally usable outside of that context anyway).

Code quality isn't perfect but I don't think I broke anything. I also don't really like having to put images under the src directory, but webpack won't compile as-is otherwise. Might want to split App.css into several files, and put some of them under public so those images can be moved into public also. Let me know if you want me to do that (or any other code-cleanup) if you decide you want to merge this.

[anaximander]

BTW, I grabbed those background images from https://www.toptal.com/designers/subtlepatterns/. If you end up using any of them, we should just make sure to give credit to the source. See https://www.toptal.com/designers/subtlepatterns/faq/.

[anaximander]

I also played around with different messages for the various "filter states" in the Bottles component. Give it a try and hopefully it will be self-explanatory. I think that kind of basic feedback as the user interacts with the search input is really helpful in understanding what they're doing, and results in a better UX.