fix up table of contents (#184)

Co-authored-by: LB Johnston <lb.johnston@virginaustralia.com>

README.md

@@ -25,8 +25,10 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
   - [Translations](#translations)
   - [Forms](#forms)
   - [Testing](#testing)
+  - [Modeladmin](#modeladmin)
   - [Misc](#misc)
 - [Tools](#tools)
+  - [Templates & Starter Kits](#templates--starter-kits)
 - [Resources](#resources)
   - [Getting started](#getting-started)
   - [Articles](#articles)
@@ -37,7 +39,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
   - [Books](#books)
   - [Showcases](#showcases)
   - [Lists](#lists)
-  - [For Editors](#for-editors)
+- [For editors](#for-editors)
 - [Community](#community)
 - [Open-source sites](#open-source-sites)