update: removed Hub recommendation

Signed-off-by: Milos Gajdos <[email protected]>

registry/get-help.md

@@ -1,3 +1 @@
 [CNCF community slack](https://slack.cncf.io/), or [Stack Overflow](https://stackoverflow.com/questions/tagged/docker+registry)
-
--	**Need a free, secure hosted registry?** Try [Docker Hub](https://www.docker.com/pricing).