[accelerator] preview cta points to mempool.space if not official build

frontend/src/app/components/accelerate-preview/accelerate-preview.component.html

@@ -219,7 +219,7 @@
               </ng-container>
 
               <!-- LOGIN CTA -->
-              <ng-container *ngIf="!isLoggedIn()">
+              <ng-container *ngIf="stateService.isMempoolSpaceBuild && !isLoggedIn()">
                 <tr class="group-first group-last" style="border-top: 1px dashed grey">
                   <td class="item"></td>
                   <td class="amt"></td>
@@ -228,6 +228,15 @@
                   </td>
                 </tr>
               </ng-container>
+              <ng-container *ngIf="!stateService.isMempoolSpaceBuild">
+                <tr class="group-first group-last" style="border-top: 1px dashed grey">
+                  <td class="item"></td>
+                  <td class="amt"></td>
+                  <td class="units d-flex">
+                    <a [href]="'https://mempool.space/tx/' + tx.txid + '#accelerate'" class="btn btn-purple flex-grow-1">Accelerate on mempool.space</a>
+                  </td>
+                </tr>
+              </ng-container>
             </tbody>
           </table>
         </div>