Use configured IPFS gateway URL for button

app/controllers/dashboard/contributions/show.js

@@ -0,0 +1,12 @@
+
+import Controller from '@ember/controller';
+import { computed } from '@ember/object';
+import config from 'kredits-web/config/environment';
+
+export default Controller.extend({
+
+  ipfsGatewayUrl: computed(function() {
+    return config.ipfs.gatewayUrl;
+  }).volatile()
+
+});

app/templates/dashboard/contributions/show.hbs

@@ -42,7 +42,7 @@
           kredits will be issued.
         </p>
         <p>
-          {{link-to "Re-submit contribution" "signup" class="button small green"}}.
+          {{link-to "Re-submit contribution …" "signup" class="button small green"}}.
         </p>
       </div>
     {{/if}}
@@ -51,7 +51,7 @@
   <div class="actions">
     <p>
       {{#if model.ipfsHash}}
-        <a href="https://ipfs.io/ipfs/{{model.ipfsHash}}"
+        <a href="{{ipfsGatewayUrl}}/{{model.ipfsHash}}"
            class="button small" target="_blank" rel="noopener">
           Inspect IPFS data
         </a>