Rename generated repo nodejs_host to nodejs

[alexeagle]

Same reasoning as bazel-contrib/rules_python#656 where we changed rules_python.

/cc @UebelAndre

[github-actions]

This issue has been automatically marked as stale because it has not had any activity for 6 months. It will be closed if no further activity occurs in 30 days. Collaborators can add a "cleanup" or "need: discussion" label to keep it open indefinitely. Thanks for your contributions to rules_nodejs!

[alexeagle]

Still a good idea

[github-actions]

This issue was automatically closed because it went 30 days without any activity since it was labeled "Can Close?"