Jenkins is programmed to send e-mails, but most people don't use it:
- the mail has all results in the attachments, but it is clumsy to
  navigate between mail reader and browser, and CSS is not correct
- there is no link to the actual results
- everybody gets a notification from Gitlab, since we also post it there

Also, everybody who I asked told me they don't like this mail. Let's get
rid of it.