Error logging in using GitHub

[nokome]

Attempting to login using GitHub gave me the error: https://hub.stenci.la/me/github/login/callback/?error=redirect_uri_mismatch&error_description=The+redirect_uri+MUST+match+the+registered+callback+URL+for+this+application.&error_uri=https%3A%2F%2Fdocs.github.com%2Fapps%2Fmanaging-oauth-apps%2Ftroubleshooting-authorization-request-errors... which points to https://docs.github.com/en/developers/apps/managing-oauth-apps/troubleshooting-authorization-request-errors#redirect-uri-mismatch

Apart from fixing the root cause of the error, it would be good if this error was handled as most other errors are handled: (a) report to Sentry, (b) a styled error page