Add IPFS pinning service

templates/main/services.html.ep

@@ -33,6 +33,15 @@
             Check it out at <a href="https://akko.unix.dog">akko.unix.dog</a>.
         </p>
     </section>
+    <section>
+        <h2>IPFS Pinning</h2>
+        <p>
+            A custom-build IPFS remote pinning service is available at UNIX.dog.
+            You can check it out a <a href="https://u.unix.dog">u.unix.dog</a>.
+            Also, it works as a simple cURL or online file uploader; you don't
+            need to use a local IPFS node :)
+        </p>
+    </section>
     <section>
         <h2>XMPP</h2>
         <p>