Light Cleanup of CSS & Restyling + License + Readme Updates

[sunnymui]

The main visual update here is the styling of the app to look a little cleaner. This is by no means comprehensive or final. There's still A LOT of CSS to clean up and a lot of things that need to be styled to look decent.

• Add an open source license file contained in license.txt, MIT license
• Update/expand the readme with some additional information and update with new setup step--add environmental vars in .env.local
• Add login button nav component
• Rewrite logo component completely, add redesigned logo image
• Actually integrated logo component into the header (it wasn't integrated) and take out the default react logo/heading
• Integrate login nav button into header
• Restyle all over the app on a very basic level to look a little more polished

[JMStudiosJoe]

Looks great so far just a couple of questions