Add simplified tracker blockchain component

frontend/src/app/components/mempool-blocks/mempool-blocks.component.html

@@ -51,7 +51,7 @@
         </div>
       </ng-template>
     </div>
-    <div *ngIf="arrowVisible" id="arrow-up" [ngStyle]="{'right': rightPosition + 75 + 'px', transition: transition }" [class.blink]="txPosition?.accelerated"></div>
+    <div *ngIf="arrowVisible" id="arrow-up" [ngStyle]="{'right': rightPosition + (blockWidth * 0.3) + containerOffset + 'px', transition: transition }" [class.blink]="txPosition?.accelerated"></div>
   </div>
 </ng-container>