fix footer to the bottom of the page

Author: Um9i

{{cookiecutter.app_slug}}/project/client/templates/footer.html

@@ -1,7 +1,11 @@
 <footer>
-  <div class="container">
-    <small>
-      <span>© <a href="mailto:[email protected]">Real Python</a></span>
-    </small>
-  </div>
+  <nav class="navbar fixed-bottom navbar-light bg-light">
+    <div class="container">
+      <small>
+        <span>©
+          <a href="mailto:[email protected]">Real Python</a>
+        </span>
+      </small>
+    </div>
+  </nav>
 </footer>