Add link with instructions for importing subscriptions to settings page

src/templates/settings.html

@@ -361,6 +361,9 @@
                 EXPORT SUBSCRIPTIONS
             </div>
         </div>
+        <a href='https://github.com/FreeTubeApp/FreeTube/wiki/Importing-Your-YouTube-Subscriptions'><p>
+          How do I import my subscriptions?
+        </p></a>
     </div>
     <div class="card">
         <h2>Advanced Settings</h2>