No - I mean something like a banner at the top of the README or at the homepage of the documentation that states, as boldly as feasible, something along the lin

No - I mean something like a banner at the top of the README or at the homepage of the documentation that states, as boldly as feasible, something along the lines of "THIS IS A PROOF OF CONCEPT/DEMO/FOR EDUCATION PURPOSES ONLY SOFTWARE THAT SHOULD NOT BE USED IN PRODUCTION"