Revert "Remove broken link in `plugin_list.ejs` (#3166)" (#3247)

The link doesn't look broken to me.

This reverts commit 44ea88a7ca1c6c72f4778f629d8d7ba6dbbf6553.

website/themes/uppy/layout/partials/plugin_list.ejs

@@ -36,7 +36,7 @@
 <iframe scrolling="no" seamless="seamless" class="Disc" src="/disc.html"></iframe>
 <p>
   This graph is built with
-  <a href="https://twitter.com/hughskennedy">Hugh Kennedy</a>’s excellent disc.
+  <a href="https://twitter.com/hughskennedy">Hugh Kennedy</a>’s excellent <a href="https://hughsk.io/disc/">disc</a>.
 </p>
 
 <h2 id="browser-support">Browser Support</h2>