workspace property in the organization or site config is not used

**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**
Add any other context about the problem here.

Start by locating the organization and site workspace property in the API specification and data model. Trace any references to confirm the property is unused, then remove it from both locations and verify that the generated or validated API model no longer exposes it.

Written by the indexing model from the issue text.