Deprecate API-Readiness-Checklist.md

[tanjadegroot]

Problem description
The API-Readiness-Checklist.md is replaced by the new updated version which is located in the Release Management project

Expected action
Deprecate or delete the API-Readiness-Checklist.md file from this repository
Refer to new file resulting from camaraproject/ReleaseManagement#29
Replace any references to the checklist in other documentation with the link to the new checklist document

Additional context

[hdamker]

@rartych Should be included into the 0.4.0 scope.