add markdown toc stuff

docs/components/scrollspy.md

@@ -3,6 +3,11 @@ layout: page
 title: Srollspy
 ---
 
+## Contents
+
+* Will be replaced with the ToC, excluding the "Contents" header
+{:toc}
+
 ## Example in navbar
 
 The ScrollSpy plugin is for automatically updating nav targets based on scroll position. Scroll the area below the navbar and watch the active class change. The dropdown sub items will be highlighted as well.