Install Wikidata access layer for Dæghrefn on viperserv role

Summary:
Install the following software:

• pywikibot
• rDWD

Ref T1309

Test Plan: Run fine on Ysul

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1309

Differential Revision: https://devcentral.nasqueron.org/D1180