Update the latest Documentation changes into develop

[adriancollier]

We have been making changes to the documentation directly in wiki-docs branch.

Now that we have more frequent releases, I feel confident in making all documentation changes within releases and ensuring that these follow the same progress as functional code changes.

This issue is to pull all the existing wiki-docs changes that are not currently part of the codebase into develop for completeness.

This might mean the removal of the wiki-docs branch in the future - but for now, this will remain as a step to complete after each release (as well as pulling this branch into develop).

[adriancollier]

We should be committing future doc changes into develop and running through release process, so no longer needed.