Updating to the OxCaml 5.2.0-minus39 opam packaging

This website is written using the OxCaml language extensions from Jane Street, so I can experiment with zero allocation frameworks written in OCaml. Since David Allsopp released oxcaml-minus39 a few weeks ago, I've updated to that. This first required figuring out the packaging of some of the third-party dependencies that I require. Using OxCaml is more complex than vanilla OCaml since many…