Point badges to main (#1748)

Author: dragomirp

README.md

@@ -1,7 +1,7 @@
 # Charmed PostgreSQL VM Operator
 
-[![CharmHub Badge](https://charmhub.io/postgresql/badge.svg)](https://charmhub.io/postgresql)
-[![Release](https://github.com/canonical/postgresql-operator/actions/workflows/release.yaml/badge.svg)](https://github.com/canonical/postgresql-operator/actions/workflows/release.yaml)
+[![CharmHub Badge](https://charmhub.io/postgresql/badge.svg?channel=14%2Fstable)](https://charmhub.io/postgresql?channel=14%2Fstable)
+[![Release](https://github.com/canonical/postgresql-operator/actions/workflows/release.yaml/badge.svg?branch=main)](https://github.com/canonical/postgresql-operator/actions/workflows/release.yaml?query=branch%3Amain)
 [![Tests](https://github.com/canonical/postgresql-operator/actions/workflows/ci.yaml/badge.svg?branch=main)](https://github.com/canonical/postgresql-operator/actions/workflows/ci.yaml?query=branch%3Amain)