refactor: simplify app initialization by removing factory

Streamlined the Flask app setup by eliminating the factory function and directly initializing the app and registering blueprints in the global scope. This reduces complexity and improves readability. No functional changes introduced.

src/small/app.py

@@ -4,8 +4,6 @@ from os import environ
 
 from .views import home, article, error, proxy
 
-
-def create_app():
 app = Flask(__name__)
 
 app.register_blueprint(home.bp)
@@ -13,11 +11,8 @@ def create_app():
 app.register_blueprint(error.bp)
 app.register_blueprint(proxy.bp)
 
-    return app
-
 
 def main():
-    app = create_app()
     port = int(environ.get("PORT", 8115))
     app.run(port=port)