Fix create links when no repositories exist

Summary: Fixes T10925. Sends users to /new/ instead of /create/

Test Plan: Visit page, see links, clicky clicky.

Reviewers: epriestley, thoughtpolice

Reviewed By: thoughtpolice

Subscribers: thoughtpolice, Korvin

Maniphest Tasks: T10925

Differential Revision: https://secure.phabricator.com/D15849