Move refresh token interval

[BuckyMaler]

• I am on the latest Channels version.
• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

A user's access token is refreshed on an interval in app/components/Home.js. I'm uncertain whether this is an appropriate file for that logic. The dilemma is when that component unmounts, the interval is cleared. This isn't an immediate issue, since nearly the entire app lives within the Home component, but if another page were introduced in the future that depends on the YouTube API, this logic could become problematic. If it's decided that the refresh logic is in the appropriate file, then perhaps only the clearInterval needs removed.