Fix duplicate content rendering in QC Playground

Remove duplicate content rendering statements that caused markdown
content to display twice on the playground page

Author: Fermious

_layouts/qc-playground.html

@@ -17,10 +17,6 @@
       <div class="container d-flex flex-column px-xxl-5">
         <div class="row flex-grow-1">
           <main class="col-12 col-lg-11 col-xl-9 px-md-4">
-            {% if page.content %}
-              {% include lang.html %}
-              {{ page.content }}
-            {% endif %}
 
 <!-- Q.js Stylesheets -->
 <link rel="stylesheet" href="{{ '/assets/css/qjs/Q.css' | relative_url }}">
@@ -236,8 +232,6 @@
 }
 </style>
 
-{{ content }}
-
 <div class="qc-playground">
   <!-- Compact Sample Circuits -->
   <div class="sample-circuits-compact">