first pass at nuking scaffolding

docs/templates/layout.mustache

@@ -58,11 +58,8 @@
             <li class="{{getting-started}}">
               <a href="./getting-started.html">{{_i}}Get started{{/i}}</a>
             </li>
-            <li class="{{scaffolding}}">
-              <a href="./scaffolding.html">{{_i}}Scaffolding{{/i}}</a>
-            </li>
-            <li class="{{base-css}}">
-              <a href="./base-css.html">{{_i}}Base CSS{{/i}}</a>
+            <li class="{{css}}">
+              <a href="./css.html">{{_i}}Core CSS{{/i}}</a>
             </li>
             <li class="{{components}}">
               <a href="./components.html">{{_i}}Components{{/i}}</a>