Fix READMEs of examples

examples/servers/simple-prompt/mcp_simple_prompt/__main__.py

@@ -1,5 +1,5 @@
 import sys
 
-from server import main
+from .server import main
 
 sys.exit(main())

examples/servers/simple-prompt/mcp_simple_prompt/server.py

@@ -37,11 +37,7 @@ def create_messages(
     return messages
 
 
-@click.group()
-def cli():
-    pass
-
-
+@click.command()
 @click.option("--port", default=8000, help="Port to listen on for SSE")
 @click.option(
     "--transport",