Remove "Schemaverse" from the "Online resources" page

The Schemaverse website no longer responds, so we don't need to
link to it.

Reported-by: Greg Sabino Mullane <[email protected]>

Author: jkatz

templates/pages/docs/online-resources.html

@@ -45,12 +45,6 @@ <h1>Tutorials &amp; Other Resources <i class="fas fa-keyboard"></i></h1>
       </td>
       <td>A handy single-paged resource and reference guide for getting started with PostgreSQL.</td>
     </tr>
-    <tr>
-      <td>
-        <a href="https://schemaverse.com/" rel="nofollow">Schemaverse</a>
-      </td>
-      <td>A space-based strategy game implemented entirely within a PostgreSQL database.</td>
-    </tr>
     <tr>
       <td>
         <a href="https://github.com/dhamaniasad/awesome-postgres" rel="nofollow">Awesome Postgres</a>