Add listings

Listing_10.23.html

@@ -1,16 +1,20 @@
-{% extends "layout.html" %}
-
-{% block content %}
-  <h1>About</h1>
-
-  <p>
-    This site is the final application in
-    <a href="https://www.learnenough.com/python-tutorial"><em>Learn Enough Python
-    to Be Dangerous</em></a>
-    by <a href="https://www.michaelhartl.com/">Michael Hartl</a>,
-    a tutorial introduction to the
-    <a href="https://www.python.org/">Python programming language</a> that
-    is part of
-    <a href="https://www.learnenough.com/">LearnEnough.com</a>.
-  </p>
-{% endblock %}
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Learn Enough Python Sample App</title>
+    <link rel="stylesheet" type="text/css" href="/static/stylesheets/main.css">
+    <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,400"
+          rel="stylesheet">
+  </head>
+  <body>
+    <a href="/" class="header-logo">
+      <img src="/static/images/logo_b.png" alt="Learn Enough logo">
+    </a>
+    <div class="container">
+      <div class="content">
+        {% block content %}{% endblock %}
+      </div>
+    </div>
+  </body>
+</html>