Add V2 in navbar

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/templates/navbar.html

@@ -26,6 +26,9 @@
             <a class="navbar-item {% active_item 'vulnerability_search' %}" href="{% url 'vulnerability_search' %}">
                 Vulnerabilities
             </a>
+            <a class="navbar-item {% active_item 'package_search_v2' %}" href="{% url 'package_search_v2' %}">
+                V2
+            </a>
             <a class="navbar-item" href="https://vulnerablecode.readthedocs.io/en/latest/" target="_blank">
                 Documentation
             </a>