Profile: unsubscribe from newsletter

[humitos]

When signing up on Read the Docs, users can subscribe to our newsletter:

We store this internally and subscribe them to the newsletter once they verify their email. In case they want to unsubscribe later they can currently do it by clicking on "Unsubscribe" from the email we sent them. However, they cannot do this from the application's Dashboard itself.

It would be good to be able to unsubscribe from the edit user's profile at https://readthedocs.org/accounts/edit/