Allow revoking / reloading github / gitlab tokens

[callmekatootie]

I find that I am unable to use any of the self sign up links for gitlab (and I think even github) because the token might be no longer applicable and needs a refresh or re-generated...

For example, accessing a self sign up link (that I created or from some other project) gives me this error:

It would be nice if the UI provides an option to delete the existing link between our github / gitlab accounts and Topcoder X to regenerate it. I think that will resolve my above issue

Implementation

On the settings tab, we'll add a red "X" button next to each item, if it's already set up. For instance, if there's a checkmark indicating that Github is set up, we'll also show a red "X" button to revoke that token.

On clicking the red "X", there should be a prompt for the user to confirm, like Are you sure you want to revoke the authorization token for Github?, Yes, No.

[jmgasper]

@callmekatootie - Thanks. I'll add this to the next challenge.