Clear Github email notification token

Prerequisites

• Are you sure that this rule only prevents tracking?
• Are you sure that this rule does not destroy the function of the page?

Description

When clicking on Github links in an email, there's a email_token field that's most likely used for tracking. I've double-checked that is not used for authentication and doesn't log in the user. The example below is for an issue, but I assume (didn't double check) that email_token is used in any mail that comes from Github. The field email_source can also be removed, even though it doesn't include an individual token.

Affected fields

1. email_token
2. email_source
3. The #issuecomment-$ID field should not be removed

Example URL

1. https://github.com/user/repository/issues/123?email_source=notifications&email_token=ABXXXX...#issuecomment-123