Update to use single directory structure instead

Author: rytswd

docs/README.md

@@ -30,7 +30,7 @@ The operator creates and manages all necessary Kubernetes resources for these co
 ### Code
 
 ```
-ROOT/src/multigres-operator/
+multigres-operator/
 ├── api/v1alpha1/           # CRD definitions
 ├── cmd/multigres-operator/ # Main entry point
 └── internal/               # Controller and resource builders
@@ -39,7 +39,7 @@ ROOT/src/multigres-operator/
 ### Documentation and Configuration
 
 ```
-ROOT
+multigres-operator/
 ├── config/                 # Kubernetes manifests
 ├── docs/                   # Architecture and guides
 └── plans/                  # Planning documents