revert: put version back in app

Author: ydcjeff

app/streamlit_app.py

@@ -7,6 +7,7 @@
 from codegen import CodeGenerator
 from utils import import_from_file
 
+__version__ = "0.1.0"
 DEV_MODE = int(os.getenv("DEV_MODE", 0)) == 1
 
 FOLDER_TO_TEMPLATE_NAME = {