Hide Drift Documentation

Prepping this PR to merge EOD today. Full context here that will be shared with GTM teams: https://paper.dropbox.com/doc/Integration-Update-Segment-Drift--BLDkOIS_w9dEAsvoe_2TRQEuAg-QQTXvGxlc72lLohyzehuS

Author: Andy

src/connections/destinations/catalog/drift/index.md

@@ -1,5 +1,6 @@
 ---
 title: Drift Destination
+hidden: true
 rewrite: true
 ---
 [Drift](http://www.drift.com/segment/?utm_source=segmentio&utm_medium=docs&utm_campaign=partners) is the world's first and only conversational marketing platform. Instead of traditional marketing and sales platforms that rely on forms and follow ups, Drift connects your business with the best leads in real-time.