Disable sidebar via stash

Change-Id: I90a89bba41ebf8cdc7dd5b14bf4762784fb834fa
diff --git a/t/custom/doc/off.html.ep b/t/custom/doc/off.html.ep
new file mode 100644
index 0000000..b907f12
--- /dev/null
+++ b/t/custom/doc/off.html.ep
@@ -0,0 +1,6 @@
+% layout 'main', sidebar_off => 1;
+
+
+<div class="intro">
+  <h2>This has no sidebar!</h2>
+</div>