Add Dune section in OCaml content

[Camilotk]

I would like to propose the addition of a tutorial on Dune, the OCaml build system, to the Fedora Developer Portal.

Dune is a fast and flexible build system for OCaml that has gained popularity among OCaml developers. It provides a uniform interface for building, testing, and installing OCaml projects, and helps manage dependencies between packages.

Adding a tutorial on Dune to the Fedora Developer Portal would be highly beneficial for OCaml developers who are new to the language and want to get started with building projects. The tutorial would provide a step-by-step guide on how to install Dune, start a new project, build the project, and run it, as well as how to add a library to a Dune project.

Inclusion of this tutorial would make the Fedora Developer Portal a more comprehensive resource for OCaml developers and help to attract new users to Fedora. I believe it would be a valuable addition to the existing resources on the portal.

I have included the tutorial in this pull request for your review. Please let me know if you have any questions or concerns. I look forward to your feedback.

Thank you for your time and consideration.

[Camilotk]

All fixed.

[jackorp]

LGTM, thanks!