Default theme: Highlight active page + hide untitled pages

Related to #302

CHANGELOG.md

@@ -11,6 +11,8 @@ Released: -
 * [Changed] Moving `LICENSE` to `LICENSE.md`
 * [Changed] Throw `LogicException` instead of `RuntimeException` when calling
             `Pico::setConfig()` after processing has started
+* [Changed] Default theme now highlights the current page and only lists pages
+            with a title in the navigation
 ```
 
 ### Version 1.0.0-beta.2

themes/default/index.twig

@@ -23,8 +23,10 @@
             <nav>
                 <a href="#" class="menu-icon"></a>
                 <ul>
-                    {% for page in pages %}
-                        <li><a href="{{ page.url }}">{{ page.title }}</a></li>
+                    {% for page in pages if page.title %}
+                        <li{% if page.id == current_page.id %} class="active"{% endif %}>
+                            <a href="{{ page.url }}">{{ page.title }}</a>
+                        </li>
                     {% endfor %}
                 </ul>
             </nav>

themes/default/style.css

@@ -222,9 +222,14 @@ blockquote {
     margin-bottom: 80px;
     color: #afe1da;
 }
-#header a { color: #afe1da; }
+#header a {
+    color: #afe1da;
+}
 #header h1 a,
-#header a:hover { color: #fff; }
+#header a:hover,
+#header .active a {
+    color: #fff;
+}
 #header h1 {
     font-weight: bold;
     margin: 0;