Move ocaml code into darklang/tablecloth-ocaml-base

[pbiggar]

https://github.com/darklang/tablecloth-base-ocaml

• Remove rescript, fsharp, website and docs, and everything associated
• move to one directory down

[pbiggar]

I've created the repo and pushed this repo's history into its main branch.

[pm5]

For those who are interested: repo is at https://github.com/darklang/tablecloth-ocaml-base (not tablecloth-base-ocaml)

[pbiggar]

Done