fix(settings): Use axios directly for health check to preven URL sanitizing

fix(settings): Use axios directly for health check to preven URL sanitizing

When using Apache with `DirectorySlash` it will respond with 301 and the URL with trailing slash.
But when using traefik as the reverse proxy it can not rewrite redirects, this leads to the problem
that the Apache response is using HTTP in the redirect but the real server (traefik) is only listening on HTTPS.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>