removed old homepage site and unused sass files

doc-src/content/homepage.haml

@@ -1,7 +0,0 @@
----
-title: Compass Home
-body_id: home
-layout: homepage
----
-
-Yo!

doc-src/content/stylesheets/screen.sass

@@ -1,18 +0,0 @@
-@import compass
-@import core/extensions
-+reset(global)
-+reset(html5)
-@import core/base-classes
-
-@import partials/theme
-@import partials/layout
-@import partials/typography
-
-@import partials/nav
-@import partials/sidebar
-@import partials/main
-@import partials/code
-
-@import syntax/syntax-theme
-
-@import core/clearing-classes