Added network page and sites back-end. Split release tiles into own component.

assets/css/style.scss

@@ -26,3 +26,11 @@ body {
     color: $primary;
     margin: 0 0 1rem 0;
 }
+
+.icon.icon-href {
+    fill: $shadow;
+
+    :hover {
+        fill: $primary;
+    }
+}