Remove SmartOS from download page

We stopped releasing Node.js binaries on SmartOS in Node.js 14 so
the link on both LTS and Curent download pages leads to a 404 page.

Author: richardlau

layouts/partials/secondary-download-matrix.hbs

@@ -2,11 +2,6 @@
   <h2>{{additional.headline}}</h2>
   <table class="download-matrix full-width">
     <tbody>
-      <tr>
-        <th>{{additional.SmartOSBinaries}}</th>
-        <td><a href="https://nodejs.org/dist/{{version.node}}/node-{{version.node}}-sunos-x64.tar.xz">64-bit</a></td>
-      </tr>
-
       <tr>
         <th>{{additional.DockerImage}}</th>
         <td><a href="https://hub.docker.com/_/node/">{{additional.officialDockerImage}}</a></td>