Use proper HTML

app/assets/index.html

@@ -42,9 +42,10 @@
     </p>
 		<div id="react-root"></div>
     <p>
-      See [my post about this technique](https://frank.sauerburger.io/2019/01/30/tls-tracking.html)
-      and the [development repository for
-      this live demonstration](https://gitlab.sauerburger.com/frank/tls-tracking).
+      See <a href="https://frank.sauerburger.io/2019/01/30/tls-tracking.html">my
+      post about this technique</a>
+      and the <a href="https://gitlab.sauerburger.com/frank/tls-tracking">development repository for
+      this live demonstration</a>.
     <p>
 	</main>
   <footer>