Outreachy Presentations for the December 2021 Round

The OCaml community participated in the December 2021 round of [Outreachy](https://www.outreachy.org/) internships. Three interns worked on a range of projects including OCaml's pre-processor ecosystem (PPX), a metrics system for the new ocaml.org website and improving the user experience in the VSCode plugin with better syntax highlighting. This meeting was an opportunity for the interns to present their work and for the community to ask questions and was [originally announced on the discuss forum](https://discuss.ocaml.org/t/friday-03-04-intern-presentations-open-attendance/9429).