chore: add the styleguide back (#2557)

Author: Foxandxss

public/docs/_includes/styleguide/_styleguide.jade

@@ -1,11 +1,11 @@
 .grid-fluid
   .c10
-    != partial("_layouts")
-    != partial("_code-examples")
-    != partial("_alerts")
-    != partial("_callouts")
-    != partial("_tables")
-    != partial("_aside")
-    != partial("_images")
+    include _layouts
+    include _code-examples
+    include _alerts
+    include _callouts
+    include _tables
+    include _aside
+    include _images
 
-//!= partial("_jump-nav")
+//include _jump-nav