[ANN] Dune 2.9.0

Dear all, on behalf of the Dune team I’m pleased to announce the release of Dune 2.9.0. This is the last release on the Dune 2.x series and could be considered a maintenance release as it mostly consists on bug fixes and miscellaneous tweaks and features for sites,
instrumentation, and mdx support.

Please find the full list of changes below:


note: This version has a serious bug where it will generate non-usable opam files if (lang dune 2.9) is used, please update to 2.9.1 if possible.