R1:356d9e8e191d

Update a Phabricator -> Arcanist include path for scripts in Phabricator

Summary: Ref T13395. Since there's very little code which really makes sense in "scripts/", I've moved most of it to other places.

Test Plan: Ran `bin/phd`.

Maniphest Tasks: T13395

Differential Revision: https://secure.phabricator.com/D20994