docs: use variabilized GitLab server FQDN in CI/CD component reference URLs

README.md

@@ -14,7 +14,7 @@ Add the following to your `.gitlab-ci.yml`:
 ```yaml
 include:
   # 1: include the component
-  - component: gitlab.com/to-be-continuous/golang/gitlab-ci-golang@4.10.0
+  - component: $CI_SERVER_FQDN/to-be-continuous/golang/gitlab-ci-golang@4.10.0
     # 2: set/override component inputs
     inputs:
       image: "registry.hub.docker.com/library/golang:buster" # ⚠ this is only an example