Introduce new name server, ns-ovh.sslip.io

- located in Warsaw, Poland
- IPv4: 51.75.53.19
- IPv6: 2001:41d0:602:2313::1

The crux of this is to take the load off ns-aws, which jumped from
$12.66 → $20.63 → $38.51 → $62.30 in the last four months due to
bandwidth charges exceeding 10 TB.

The real fix is to randomize the order in which the nameservers are
returned.

k8s/document_root_sslip.io/index.html

@@ -143,14 +143,20 @@ src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script> <![endif]-->
             <td>USA</td>
           </tr>
           <tr class="even">
+            <td><code>ns-azure.sslip.io.</code></td>
+            <td>52.187.42.158</td>
+            <td>Singapore</td>
+          </tr>
+          <tr class="odd">
             <td><code>ns-gce.sslip.io.</code></td>
             <td>104.155.144.4</td>
             <td>USA</td>
           </tr>
-          <tr class="odd">
-            <td><code>ns-azure.sslip.io.</code></td>
-            <td>52.187.42.158</td>
-            <td>Singapore</td>
+          <tr class="even">
+            <td><code>ns-ovh.sslip.io.</code></td>
+            <td>51.75.53.19<br>
+            2001:41d0:602:2313::1</td>
+            <td>Poland</td>
           </tr>
         </tbody>
       </table>