Transition to .gitlab prefix

Expect repo to be subtree'd as ".gitlab"

README.md

@@ -0,0 +1,10 @@
+# Adding the "common" subtree as your .gitlab folder
+
+```bash
+# Add the subtree as a remote
+git remote add common git@gitlab.ducoterra.net:services/common.git
+git subtree add --prefix .gitlab common main
+
+# Now you can run the following to update
+git subtree pull --prefix .gitlab common main
+```