Simplify plugin-helper state configuration

plugin-helper.toml.example

@@ -1,11 +1,8 @@
-[[profiles]]
-id = "linux"
-label = "Local Linux BSManager"
 instances_root = "~/.local/share/BSManager/BSInstances"
-state_dir = ".state"
+state_dir = "~/.local/state/plugin-helper"
 
-[[profiles]]
-id = "windows"
-label = "Mounted Windows BSManager"
-instances_root = "~/Windows/Users/pleb/BSManager/BSInstances"
-state_dir = ".state-windows"
+# To keep state inside this checkout instead:
+# state_dir = ".state"
+#
+# To share one state directory between Linux and a Windows-partition checkout:
+# state_dir = "~/Windows/Users/pleb/ops/plugin-helper/.state"