Update the links for the groupme protocol to the active repository

Testing Done:
Ran the devserver and verified everything looked okay.

Reviewed at
title: Supported Languages
date: 2021-02-18T23:01:27.000Z
anchor: supported-languages
weight: 300
The list below contains all the languages Pidgin has been translated into. If
your native language is missing from this list or you've found a translation
contains errors, you can help us! Take a look at our [internationalization]({{<
ref "development/i18n" >}}) page.
{{< i18n-languages >}}