Introducing main.sass stylesheet

Blender Cloud used main.css from Pillar

As we try to strip Blender Cloud-specific content from Pillar,
this commit brings three .sass files over to this repository.

There are still plenty of Blender Cloud classes all over Pillar,
they will be brought here over time.

src/styles/main.sass

@@ -0,0 +1,26 @@
+@import ../../../pillar/src/styles/_normalize
+@import ../../../pillar/src/styles/_config
+@import ../../../pillar/src/styles/_utils
+
+/* Generic styles (comments, notifications, etc) come from base.css */
+
+/* Blender Cloud specific styles */
+@import ../../../pillar/src/styles/_project
+@import ../../../pillar/src/styles/_project-sharing
+@import ../../../pillar/src/styles/_project-dashboard
+@import ../../../pillar/src/styles/_user
+@import _welcome
+@import _homepage
+@import _services
+@import _stats
+@import ../../../pillar/src/styles/_search
+@import ../../../pillar/src/styles/_organizations
+
+/* services, about, etc */
+@import ../../../pillar/src/styles/_pages
+
+/* plugins are included here, don't include in base unless needed by other pillar apps */
+@import ../../../pillar/src/styles/plugins/_jstree
+@import ../../../pillar/src/styles/plugins/_js_select2
+
+/* CSS for pillar-font comes from fontello.com using static/assets/font/config.json */