Condense renames in Differential ToC

Summary: It's currently quite confusing.

Test Plan:
  lang=diff
  diff --git a/bin/config b/bin/x
  similarity index 100%
  rename from bin/config
  rename to bin/x
  diff --git a/bin/aphlict b/bin/y/aphlict
  similarity index 100%
  rename from bin/aphlict
  rename to bin/y/aphlict
  diff --git a/bin/diviner b/scripts/z
  similarity index 100%
  rename from bin/diviner
  rename to scripts/z

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin, AnhNhan

Differential Revision: https://secure.phabricator.com/D5708