Miscellaneous UI polish

[nchaloult]

Isn't quite enough to close issue 10, but we're close!

Related to #10

Overhauled the aesthetics to get us very close to our final overall design aesthetic.

Features Implemented

• Responsive design
  • Adapts to multiple display sizes
    • Should be mobile-friendly? Haven't tested on a mobile device tho
• Refreshing touches
  • Fresh coat of paint
  • New monospaced font for displaying the "tree printout"
  • Buttons and headers centered on the page
• Dynamically-appearing UI elements
  • The "Badges" and "Tree" boxes are invisible until the Go button is pressed
  • Those boxes begin appearing as soon as we have fetched content for them to display

Features Not Implemented

• We haven't yet decided on an official app title, so the current "Swegg App Title" isn't "finished"
• The "Copy to Clipboard" buttons shouldn't be as large as the "Go" button
  • The "Go" button serves as our call-to-action button, while the "Copy to Clipboard" buttons serve as less important utilities