add nextcloud to services

pages/en/services.html

@@ -30,6 +30,11 @@
       <a href="/events">events</a> resources, and tutorials.
     </td>
   </tr>
+  <tr>
+    <td><a href="https://nextcloud.dmz.rs/">Nextcloud</a></td>
+    <td><a href="https://nextcloud.com/">Nextcloud</a> instance on which we organize tasks we need to do and use as calandar.
+    </td>
+  </tr>
   <tr>
     <td><a href="https://search.dmz.rs/">Search</a></td>
     <td><a href="https://github.com/hnhx/librex/">LibreX</a> instance used for Web searching.</td>

pages/sr/services.html

@@ -34,6 +34,11 @@
     <td><a href="https://js.wiki/">Wiki.js</a> instanca koju koristimo da dokumentujemo naše
       <a href="/projects">projekte</a> kao i ostale <a href="/events">događaje</a>.
     </td>
+    <td><a href="https://nextcloud.dmz.rs/">Wiki</a></td>
+    <td><a href="https://nextcloud.com/">Nextcloud</a> instanca koju koristimo da zapisujemo stvari koje planiramo da uradimo i kao kalendar.
+    </td>
+  </tr>
+  <tr>
   </tr>
   <tr>
     <td><a href="https://search.dmz.rs/">Search</a></td>