General cleanup

[SilasPeters]

There are several minor things which can be done to improve the maintainability of r.a.d.i.o., some of which can prevent a future break in our system.

• [ ] Remove scrollIntoView
  • We currently use a package for automatically scrolling something into view, while this feature is already supported by modern browsers
• [ ] Remove moment
  • moment is a package used to get the current date. I was told it was slow and old, so we might want to replace it.
• [x] Get rid of deprecated features
  • Like findDOMnode in Activity.jsx, we should remove deprecated stuff.
• [ ] Get rid of babel
  • This might be the most important thing in here. It his highly deprecated, and our build can break any time. Whilst we do not directly use it, some packages are dependent on babel. We need to find and exterminate those packages - or ask them to leave.
  • NPM even gives us a big warning about this when running the linter.

[stickyPiston]

An update for this issue:

• the first point is implemented in ccd5d72db5c94f515925a4dbd8b8d668051b608b (in #142),
• the last point is implemented in #144, since the deprecation warning most likely came from the create-react-app config which is not maintained anymore