Update Documentation

[amlannandy]

Description

This PR updates the documentation of the project.

• Most of the documentation has been moved to the Project Wiki with the main readme only containing basic information now.
• Labeller documentation has also been moved to the Wiki, so its corresponding Readme has been removed.

Fixes #594
Fixes #598

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

N/A

Test Configuration:

N/A

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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
• Any dependent changes have been merged and published in downstream modules