base template: read README as utf-8 (#2064)

reflex/.templates/apps/base/code/pages/index.py

@@ -13,6 +13,6 @@ def index() -> rx.Component:
     Returns:
         The UI for the home page.
     """
-    with open("README.md") as readme:
+    with open("README.md", encoding="utf-8") as readme:
         content = readme.read()
     return rx.markdown(content, component_map=styles.markdown_style)