Update onbtc image and url

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

@@ -343,7 +343,7 @@
       <a href="https://opencrypto.org/" title="Coppa - Crypto Open Patent Alliance">
         <img class="copa" src="/resources/profile/copa.png" />
       </a>
-      <a href="" title="Oficina Nacional del Bitcoin">
+      <a href="https://bitcoin.gob.sv" title="Oficina Nacional del Bitcoin">
         <img class="sv" src="/resources/profile/onbtc-full.svg" />
       </a>
     </div>