feat: Build learn-ocaml-www.zip → learn-ocaml --contents-dir=www

[erikmd]

• Kind: feature

Description

The aim is to build/deploy (among the release assets) an archive learn-ocaml-www.zip so that we can do:

unzip learn-ocaml-www.zip
mkdir server && cd server
learn-ocaml build serve --contents-dir="$(readlink -f ../www)"

Checklist

• Read the CONTRIBUTING.md guide and:
  • Use Atomic Commits so each commit gathers a single logical change
  • Use Conventional Commits regarding commit messages (needed by our release toolchain)
• Add/update documentation

Note to maintainers

• Read this wiki page
• Make sure the PR has a milestone
• Assign yourself before merging
• We can squash-merge 1-commit PRs (use a header with a conventional-commit type, add a footer with Fix #… if need be)

[erikmd]

Apparently, looks fine (I did a diff -r -u between the artifact and a previous, manual version of the archive).