add markdown toc stuff

docs/components/tables.md

@@ -5,6 +5,11 @@ title: Tables
 
 Due to the widespread use of tables across third-party widgets like calendars and date pickers, we've designed our tables to be **opt-in**. Just add the base class `.table` to any `<table>`.
 
+## Contents
+
+* Will be replaced with the ToC, excluding the "Contents" header
+{:toc}
+
 ## Basic example
 
 {% example html %}