Update tech-docs-template

Using the following command and accepting all changes except `.gitignore`
which would have partially reverted 2f9a75c:

  bundle exec middleman init . -T alphagov/tech-docs-template

The update address two issues that have been fixed upstream:

- alphagov/tech-docs-template#118 to re-add H1 dividers which we already
  applied in a5ab659
- alphagov/tech-docs-template#120 to render correctly when Javascript is
  disabled

.template_version

@@ -1,3 +1,3 @@
 ---
 :remote: https://github.com/alphagov/tech-docs-template.git
-:revision: head
+:revision: eb730095465c751462a691350f6968227f8aa325

source/stylesheets/modules/_app-pane.scss

@@ -49,7 +49,8 @@
       }
     }
 
-    .no-flexbox.no-flexboxtweener {
+    .no-flexbox.no-flexboxtweener,
+    .no-js {
       .app-pane__toc {
         float: left;
         width: $toc-width;