Update sample config with possible orgmode settings.

sample.config.yaml

@@ -21,6 +21,10 @@ matrix:
   # What to name the logged in device
   device_name: molly
 
+orgmode:
+  # The filepath for matrix-refile.org
+  refile: "/data/matrix-refile.org"
+  
 storage:
   # The database connection string
   # For SQLite3, this would look like: