Use cncf/people for people info

As an alternative to pulling from the github url, pull person information from [cncf/people/people.json](https://github.com/cncf/people/blob/main/people.json) . This will ensure that the information matches any information present on cncf.io

Locate the current code that pulls person information from a GitHub URL, then inspect cncf/people/people.json as the proposed source. Compare the available person fields with the information currently shown and verify that the result matches cncf.io. Done means person information is sourced from people.json rather than the GitHub URL and the existing behavior remains usable.

Written by the indexing model from the issue text.