build(aio): remove formatting and styles from dgeni templates

Much of the formatting was hardcoded and copied from the old anguar.io
jade files. This gives us a clean start.

Also, more use has been made of include files to make the templates
easier to understand and manage.

docs/templates/includes/_class-overview.html

@@ -0,0 +1,40 @@
+<section class="class-overview">
+  <h2>Class Overview</h2>
+  <div class="api-doc-code">
+
+    <code class="no-bg openParens">class {$ doc.name $} {</code>
+
+    {% if doc.statics.length %}
+    <div class="statics">
+      {% for member in doc.statics %}{% if not member.internal %}
+        <pre class="prettyprint no-bg-with-indent"><code>static
+          <a class="code-anchor" href="#{$ member.name $}-anchor">{$ member.name | indent(6, false) | trim $}</a>
+          {$ params.paramList(member.parameters) | indent(8, false) | trim $}{$ params.returnType(member.returnType) $}
+        </code></pre>
+      {% endif %}{% endfor %}
+    </div>
+    {% endif %}
+
+
+    {% if doc.constructorDoc.name %}
+    <div class="constructor">
+      <pre class="prettyprint no-bg-with-indent"><code>
+        <a class="code-anchor" href="#constructor">{$ doc.constructorDoc.name $}</a>
+          {$ params.paramList(doc.constructorDoc.parameters) | indent(8, false) | trim $}
+      </code></pre>
+    </div>
+    {% endif %}
+
+    {% if doc.members.length %}
+    <div class="members">
+      {% for member in doc.members %}{% if not member.internal %}
+        <pre class="prettyprint no-bg-with-indent"><code>
+          <a class="code-anchor" href="#{$ member.name $}-anchor">{$ member.name | indent(6, false) | trim $}</a>
+          {$ params.paramList(member.parameters) | indent(8, false) | trim $}{$ params.returnType(member.returnType) $}
+        </code></pre>
+      {% endif %}{% endfor %}
+    {% endif %}
+
+    <code class="endParens api-doc-code no-bg">}</code>
+  </div>
+</section>