Site Redesign and Finishing up User Experience

[samolds]

This is a big PR and has hardly anything to do with a help page.

• This redesigns all of the pages except for the simulator page (I think Danny was working on that).
• The home page is now actually filtered by simulation ratings
• There is a "My Interactions" page where users can see a list of simulations they have starred or commented on
• User can now browse other user's profiles
• There is a description field added to simulations
• There is a limited mobile view of the simulation page for users to just watch a simulation but not interact on mobile.

Fixes #146 Fixes #117 Fixes #113 Fixes #110