add help link to center panel

app/assets/stylesheets/main/shared.scss

@@ -79,6 +79,10 @@ body[data-controller=landing].app-background {
     max-width: 1100px;
   }
 
+  .panel {
+    position: relative;
+  }
+
   .input-spacing {
     margin-top: 15px;
   }
@@ -173,3 +177,10 @@ a.signin-link {
 .invite-join-wrapper {
   position: relative;
 }
+
+.help-link {
+  position: absolute;
+  top: 0;
+  right: 0;
+  padding-right: 3px;
+}

app/views/shared/_center_panel.html.erb

@@ -24,6 +24,9 @@
           <%= yield %>
         </div>
         <%= yield :footer %>
+        <div class="help-link">
+          <%= link_to t('help'), help_url %>
+        </div>
       </div>
     </div>
   </div>