UI facelift

[ccstan99]

Figma prototype for a UI facelift to dress up existing functionality. Chatbot design is at the bottom of the page. I'd recommend tackling the low hanging fruit first: styling colors, fonts, etc then work on other aspects as time permits. A more detailed overhaul is in progress...

Things not specified:

• Background colors for human-written FAQ answers should be different. Can use the same background color for on hover.
• Citation can remain multicolored shouldn't be rainbow. Let's pick some equally spaced values from the viridis color palette, something like: [#3e1450, #422a73, #404884, #3f638a, #437b8c, #4c948b, #5aab82, #77c271, #a4d55a]