docs(pgs): _redirects copy

pgs/html/help.page.tmpl

@@ -108,9 +108,36 @@
       <li>woff</li>
       <li>woff2</li>
       <li>md</li>
+      <li>rss</li>
+      <li>xml</li>
+      <li>atom</li>
+      <li>map</li>
+      <li>webmanifest</li>
     </ul>
   </section>
 
+  <section id="redirects">
+    <h2 class="text-xl">
+      <a href="#redirects" rel="nofollow noopener">#</a>
+      User-defined Redirects
+    </h2>
+    <p>
+      We support custom redirects via a special file <code>_redirects</code>.
+      Read more about it at <a href="https://docs.netlify.com/routing/redirects">netflify</a>
+    </p>
+  </section>
+
+  <section id="spa">
+    <h2 class="text-xl">
+      <a href="#spa" rel="nofollow noopener">#</a>
+      Single-Page Applications (SPAs)
+    </h2>
+    <p>
+      pgs supports SPAs!  Upload a <code>_redirects</code> file your project:
+    </p>
+    <pre>/*  /index.html  200</pre>
+  </section>
+
   <section id="custom-domain">
     <h2 class="text-xl">
       <a href="#custom-domain" rel="nofollow noopener">#</a>

pgs/html/marketing.page.tmpl

@@ -63,7 +63,9 @@
       <li>Deploy via <code>scp -r ./public/* erock@{{.Site.Domain}}:/myproject</code></li>
       <li>Promotion/rollback support (via symbolic linking from one project to another)</li>
       <li>Managed HTTPS for all projects (e.g. https://erock-myproject.{{.Site.Domain}})</li>
-      <li>Custom domains for projects (managed simply by `TXT` records)</li>
+      <li><a href="/help#custom-domain">Custom domains</a> for projects (managed simply by `TXT` records)</li>
+      <li><a href="/help#redirects">User-defined redirects</a></li>
+      <li><a href="/help#spa">SPA support</a></li>
       <li>1GB max storage</li>
       <li>50MB max file size</li>
       <li>All assets are public-only</li>