Remove startup directories (#12)

example/DOCS.md

@@ -12,4 +12,4 @@ Follow these steps to get the add-on installed on your system:
 
 This add-on really does nothing. It is just an example.
 
-When started it will print "Hello world" in the log and exit.
+When started it will print the configured message or "Hello world" in the log.

example/config.yaml

@@ -10,7 +10,6 @@ arch:
   - aarch64
   - amd64
   - i386
-startup: once
 options:
   message: "Hello world..."
 schema: