build(aio): refactor API templates for clean start

aio/tools/transforms/templates/api/includes/constructor.html

@@ -0,0 +1,8 @@
+{%- if doc.constructorDoc and not doc.constructorDoc.internal %}
+<section class="constructor">
+  <a id="{$ doc.constructorDoc.name $}"></a>
+  <h2>Constructor</h2>
+  <code-example hideCopy="true">{$ doc.constructorDoc.name $}{$ params.paramList(doc.constructorDoc.parameters) $}</code-example>
+  {% if not doc.constructorDoc.notYetDocumented %}{$ doc.constructorDoc.description | marked $}{% endif %}
+</section>
+{% endif %}