Add back navigation link to vulnerability details page

Signed-off-by: rajanarahul93 <rajanarahul93@gmail.com>

Author: rajanarahul93

vulnerabilities/templates/vulnerability_package_details.html

@@ -20,6 +20,10 @@
                 <span class="tag is-white custom">
                     {{ vulnerability.vulnerability_id }}
                 </span>
+                <br />
+                <a href="{% url 'vulnerability_details' vulnerability.vulnerability_id %}" class="button is-small is-link mt-2">
+                  ← Back to Vulnerability {{ vulnerability.vulnerability_id }}
+                </a>
             </div>
         </article>
             <div id="tab-content">