nn_ocaml how to set up opam switch create . eval $(opam env) opam install . --deps-only how to run dune exec nn_ocaml how to build dune build watch mode dune build -w how to test dune test watch mode dune test -w how to format dune fmt --auto-promote how to build documentation dune build @doc open it open _build/default/_doc/_html/index.html