Replace README Developer Information section with Table of contents

[adrianclay]

What

Replace README Developer Information section with Table of contents

Why

The existing Developer Information felt like some links out to other documents.

Having a clear table of contents feels like a clearer way of achieving the same outcome.

Type of change

Please delete options that are not relevant.

• Internal change (non-breaking change with no effect on the functionality affecting end users)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users
• A corresponding change has been made to the Mapping Documentation repository