added platform

layouts/_partials/side-tree.html

@@ -0,0 +1,12 @@
+{{- /* Nested page list for sections with subsections. Expands only the branch containing the current page. */ -}}
+{{ $current := .current }}
+<ul>
+  {{ range .pages.ByWeight }}
+  <li>
+    <a href="{{ .RelPermalink }}"{{ if eq $current . }} aria-current="page"{{ end }}>{{ .LinkTitle }}</a>
+    {{ if and .IsSection (or (eq $current .) ($current.IsDescendant .)) }}
+      {{ with .Pages }}{{ partial "side-tree.html" (dict "pages" . "current" $current) }}{{ end }}
+    {{ end }}
+  </li>
+  {{ end }}
+</ul>

layouts/_partials/sidebar.html

@@ -40,4 +40,10 @@
     {{ end }}
   </div>
   {{ end }}
+  {{ with site.GetPage "/platform" }}
+  <div class="side-group">
+    <a class="side-heading{{ if eq $current . }} is-current{{ end }}" href="{{ .RelPermalink }}"{{ if eq $current . }} aria-current="page"{{ end }}>{{ .Title }}</a>
+    {{ partial "side-tree.html" (dict "pages" .Pages "current" $current) }}
+  </div>
+  {{ end }}
 </nav>