Disconnect from Github

[deoktr]

Give ability to disconnect Dhost account from Github account, with revoke of the Github token.
Must check that the user has a password a username and an email set.

Make it available via the API ?

[deoktr]

https://simpleisbetterthancomplex.com/tutorial/2016/10/24/how-to-add-social-login-to-django.html

[github-actions]

Stale issue message