workspace property in the organization or site config is not used

[iuliag]

Description
There is a workspace property in the organization and site config that is not used anywhere, as there's one internal and one external workspace defined and their values come from the environment variables of the deployment.

Proposal(s):

1. clean up the property from the API spec and data model

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Version:
run: $ hlx --version

Additional context
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