hugo: do not render hidden cli options

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

layouts/_default/cli.html

@@ -102,7 +102,7 @@
           </tr>
         </thead>
         <tbody>
-          {{ range . }}
+          {{ range where . "hidden" false }}
             <tr>
               <td>{{ with .option }}<code>--{{ . }}</code>{{ end }}</td>
               <td>{{ with .shorthand }}<code>-{{ . }}</code>{{ end }}</td>