Update /developers an "under construction" message

Add:
        templates/developers.html
                -Update the developers page with an "under construction"
                message.

        static/sass/developers.sass
                -Add a bare-bones stylesheet for the developers page.

static/sass/developers.sass

@@ -0,0 +1,7 @@
+@import variables
+
+a
+    text-decoration: none
+
+h1
+    color: $baseColor1

templates/developers.html

@@ -4,8 +4,15 @@
   About
 = endblock
 
+= block head
+  {{ assets.tag("developers.css") }}
+= endblock
+
 = block body
   <div>
-    For developers, son.
+    <h1>Page under construction</h1>
+    <p>
+      Check back later. Have you read our <a href="/about">about page</a> and the <a href="/docs">docs</a>?
+      </p>
   </div>
 = endblock