Extend Nest API with OWASP Staff data

**Describe the solution you'd like**
We may extend Nest API to have Staff data. We may need to update OWASP app models for this.

**Are you going to work on implementing this?**

- [x] Yes
- [ ] No

**Additional context**
https://github.com/OWASP/owasp.github.io/blob/main/_data/staff.yml

Start with the linked OWASP staff.yml file and trace the Nest API's existing model and endpoint entry points. Determine which staff fields need representation and exposure, then identify the relevant API tests; done means the staff data is available through the API with coverage for the new behavior.

Written by the indexing model from the issue text.