chore: apply feedback on readme and vars

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/vars/addons.sample.yaml

@@ -28,7 +28,7 @@ weave_gitops:
 # https://github.com/kubernetes-csi/csi-driver-nfs
 csi_driver_nfs:
   enabled: false
-  storage_class: []
+  storage_class:
     # - name:   # name of the storage class (must match [a-z0-9-]+)
     #   server: # dns name or ip address of nfs server
     #   share:  # exported share (path)

bootstrap/vars/config.sample.yaml

@@ -43,13 +43,13 @@ bootstrap_service_cidr: 10.43.0.0/16
 # Node information
 bootstrap_nodes:
   # Use only 1, 3 or more odd master nodes, recommended is 3
-  master: []
+  master:
     # - name:     # name of the master node (must match [a-z0-9-]+)
     #   address:  # ip address of the master node
     #   username: # ssh username of the master node
     #   password: # password of ssh username for the master node
     # ...
-  worker: []
+  worker:
     # - name:     # name of the worker node (must match [a-z0-9-]+)
     #   address:  # ip address of the worker node
     #   username: # ssh username of the worker node