[#2154003] Removing CSS, it should be compiled by a build system and by...

[#2154003] Removing CSS, it should be compiled by a build system and by contributors making changes.

README.txt

+This theme is for Drupal.org sites.
+
+
+## Where’s the CSS?
+
+CSS is compiled with Compass. See https://drupal.org/node/1953368 for more
+information.
+
+Dev VMs come with a pre-compiled version, and Compass set up to compile
+changes. See https://drupal.org/node/1018084 for more information.