[bundle] explicit versions, vagrant dep
[veewee] update base nixos ISO image
[veewee] tweak initial boot interaction timing
[veewee] crank up the VM memory for now
[veewee] opam depends on `ocaml` and *external* `which`
[veewee] install `opam` once box built
[git] many ISO
[make] why README when you can MAKE
[readme] proseify the makefile