### Related user(s): _No response_ ### Related issue(s) or PR(s): _No response_ ### Related project scope(s): web-app UI ### The problem: In case of bug, many users won't have the habit to open the upstream repo and file an issue. ### Wanted solution: * Add Feedback button in Learn-OCaml Web UI, linking to any of (or both): * https://github.com/learn-ocaml-community/teaching-feedback/ * https://github.com/ocaml-sf/learn-ocaml/issues/new/choose ### Considered alternatives: _No response_ ### Additional context: _No response_