docker: Revert health check addition from #555

Dockerfile

@@ -3,7 +3,5 @@ MAINTAINER Philipp C. Heckel <philipp.heckel@gmail.com>
 
 COPY ntfy /usr/bin
 
-HEALTHCHECK --interval=60s --timeout=10s CMD wget -q --tries=1 http://localhost/v1/health -O - | grep -Eo '"healthy"\s*:\s*true' || exit 1
-
 EXPOSE 80/tcp
 ENTRYPOINT ["ntfy"]