Changes after copy edit

Editor's corrections
Addition: contents page and introduction

Completed contents page and added introduction
Editor's corrections to resources section

Editor's corrections to resources section
Introduction

Changed file extension to md
Merge pull request #16 from emmaattwell/gh-pages

Merging 'Changes after copy edit' now, though I haven't checked the files closely, we'll have a chance to check output at proofs/web output.