Updated ToC sequence to match content in page
Content in page lists 'Running Chime locally' section before 'Project Layout' section. Updated the ToC to reflect this.
## Table of Contents
- [Developer Requirements](#developer-requirements)
-- [Project Layout](#project-layout)
- [Running CHIME Locally](#running-chime-locally)
+- [Project Layout](#project-layout)
- [Testing](#testing)
- [Validating CHIME](#validating-chime)
