Add a CSS-only way of making navigation menu's look good.

site/stylesheet.css

@@ -178,3 +178,21 @@ pre {
 .org-variable-name {
     color: #268bd2;
 }
+
+/* Navigation menu */
+#content > ul:first-of-type {
+    margin: 0;
+    text-align: center;
+}
+
+#content > ul:first-of-type li {
+    display: inline;
+}
+
+#content > ul:first-of-type li:before {
+    content: "[ "
+}
+
+#content > ul:first-of-type li:after {
+    content: " ]"
+}