[Private videos] UI for flagging a coding session as private

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- Published on Sep 26, 2019馃審 Public

Now we are going to be able to flag a coding session as private. This means that only you can see it (when you are logged in). It will also show in your profile but with a 馃敀 so you can identify the private ones.

In this commit I was applying the final UI design for flagging a session as public or private. We are using https://react-switch.netlify.com/for the admin switch.