🐞 Nameservers: ns-ovh-sg is dead, long live ns-do-sg

ns-ovh-sg, at $60/month, was an expensive experiment. I suspected the
traffic would be voluminous, matching ns-ovh. That wasn't the case: it
wasn't even a tenth of the traffic.

The Digital Ocean droplet costs ~$24/month, almost a third of the OVH
offering,

```
ns-do-sg.sslip.io
"Queries: 33781674 (641.4/s)"

ns-hetzner.sslip.io
"Queries: 89852958 (1716.1/s)"

ns-ovh.sslip.io
"Queries: 661406550 (12670.2/s)"
```

k8s/document_root_sslip.io/index.html

@@ -124,23 +124,23 @@ src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script> <![endif]-->
         </thead>
         <tbody>
           <tr class="odd">
+            <td><code>ns-do-sg.sslip.io.</code></td>
+            <td>146.190.110.69<br>
+              2400:6180:0:d2:0:1:da21:d000</td>
+            <td>Singapore</td>
+          </tr>
+          <tr class="even">
             <td><code>ns-hetzner.sslip.io.</code></td>
             <td>5.78.115.44<br>
               2a01:4ff:1f0:c920::</td>
             <td>USA</td>
           </tr>
-          <tr class="even">
+          <tr class="odd">
             <td><code>ns-ovh.sslip.io.</code></td>
             <td>51.75.53.19<br>
               2001:41d0:602:2313::1</td>
             <td>Poland</td>
           </tr>
-          <tr class="odd">
-            <td><code>ns-ovh-sg.sslip.io.</code></td>
-            <td>51.79.178.89<br>
-              2402:1f00:8001:d59::1</td>
-            <td>Singapore</td>
-          </tr>
         </tbody>
       </table>
       <p>Let’s test it from the command line using <code>dig</code>:</p>