#25 Public reports

* adds public report rendering for intervention model
* adds new routes for report
* adds new public_base.html and public_navbar.html
* adds lookup table for zoom levels for lanis link generating
* moves qr code generating into utils/generators.py

templates/navbars/public_navbar.html

@@ -0,0 +1,8 @@
+
+<nav class="navbar navbar-expand-lg navbar-dark">
+    <a href="{% url 'home' %}">
+        <div class="nav-icon badge">
+            <strong>KSP</strong>
+        </div>
+    </a>
+</nav>