Reformat README as Remarkup

Summary: We have Remarkup, so why not use it?

Test Plan: See D9946.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9948

README

@@ -11,13 +11,10 @@ Phabricator includes applications for:
   - also some other things.
 
 You can learn more about the project (and find links to documentation and
-resources) here:
+resources) [[http://phabricator.org/ | here]].
 
-  http://phabricator.org/
-
-Phabricator is developed and maintained by Phacility. The first version of
-Phabricator was originally built at Facebook.
-
-LICENSE
+Phabricator is developed and maintained by [[http://phacility.com/ |
+Phacility]]. The first version of Phabricator was originally built at Facebook.
 
+= LICENSE =
 Phabricator is released under the Apache 2.0 license except as otherwise noted.