Adding profile photos for logged in users

from discussion with @lhvy
- (frontend task)
- pretend that you have a route where you can make a post request to the route with the file
- add a UI to upload a photo, crop it, resize, etc.
- add the button to add a profile pic somewhere where they're logged in (like sidebar)
- then also add the popup that appears and submit button
- make liberal use of packages to do this - it can do the resizing, previewing, etc.
- there's libraries specifically for react that do this