Xyzzy 2 electric boogaloo (#569)

* checkin

* three pages of cheatsheet goodness

* Delete index.md

Author: sanscontext

src/_data/catalog/destination_categories.yml

@@ -1,5 +1,5 @@
 # AUTOGENERATED FROM PLATFORM API. DO NOT EDIT
-# destination categories last updated 2020-01-28 
+# destination categories last updated 2020-01-29 
 items:
 - display_name: Email Marketing
   slug: email-marketing