* feat: nginx + robots.txt
* feat: minimal /health/ endpoint
* ci: startupProbe for datatracker pod
* ci: probe auth pod; set timeoutSeconds
* feat: add CSP and other headers to nginx
* fix: typo in nginx.conf
* feat: split auth/dt nginx confs
* test: test health endpoint
* ci: auth service on port 80
We'll remove http-old (8080) in the future.
* ci: rename auth container/nginx cfg
