Rename nginx references to be more generic, as we now use nc not nginx

[dfarrell07]

Because of difficulty finding up-to-date, rootless nginx container images (required for OpenShift), we've moved to a much simpler nc-based "simpleserver". However, there are still very many references to nginx in the code, especially Lighthouse code. Ideally we'd rename these to be more generic, correct.

[stale]

This issue has been automatically marked as stale because it has not had activity for 60 days. It will be closed if no further activity occurs. Please make a comment if this issue/pr is still valid. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had activity for 60 days. It will be closed if no further activity occurs. Please make a comment if this issue/pr is still valid. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had activity for 60 days. It will be closed if no further activity occurs. Please make a comment if this issue/pr is still valid. Thank you for your contributions.