Update app.py

app.py

@@ -27,6 +27,8 @@ This tool lets you check if a repository under a given username is part of The S
 """
 
 opt_out_text_template = """\
+### Opt-out
+
 If you want your data to be removed from the stack and model training open an issue with [this link](https://github.com/bigcode-project/opt-out/issues/new?title={title}&body={body}).\
 """