Impossible to delete account

[lichtner]

• I wanted to delete account but I did not find it here https://www.larabug.com/panel
• or change github account to email account it is impossible too

Background: At first I register via github, it worked. Then I install mobile app but I realized that in mobile app is impossible to login via github only via password. So I wanted to delete account and register again, but it was impossible. Then I wanted to change github account to email account and it was impossible too ;-)

please add one or better both function to admin panel. Thanks.