Add "Debugging" section to README

And link to the various docs that were previously in the table of
contents.

README.md

@@ -65,13 +65,12 @@ See [development using the GDS development virtual machine](developing-using-vm.
 * [Testing](doc/testing.md)
 * [Updating worldwide fixture data](doc/updating-worldwide-fixture-data.md)
 
-## Licence
+### Debugging
 
-[MIT License](./LICENSE.md)
+* [Viewing landing pages and outcomes as Govspeak](doc/viewing-templates-as-govspeak.md)
+* [Viewing state of a Smart Answer](doc/viewing-state.md)
+* [Visualising flows](doc/visualising-flows.md)
 
-## Table of Contents
+## Licence
 
-* Debugging
-  * [Viewing landing pages and outcomes as Govspeak](doc/viewing-templates-as-govspeak.md)
-  * [Viewing state of a Smart Answer](doc/viewing-state.md)
-  * [Visualising flows](doc/visualising-flows.md)
+[MIT License](./LICENSE.md)