Remove tshirt promo.

frontend/src/app/components/sponsor/sponsor.component.html

@@ -57,15 +57,7 @@
           </form>
         </div>
 
-
         <br><br>
-
-        <p style="max-width: 500px; margin: auto;">If you make a donation and visit our booth at the Bitcoin 2021 conference in Miami, we'll give you a set of mempool and bisq t-shirts as our Thank You gift :) (While supplies last)</p>
-
-        <br><br>
-
-        <img src="/resources/tshirts.png" width="477">
-
       </ng-template>
 
       <div *ngIf="donationStatus === 2" class="text-center">