KitDocs playground

KitDocs: https://github.com/svelteness/kit-docs/

Parent issue: https://github.com/stephane-klein/personnal-notebook/issues/23

This repository is configured like a monorepo:

• the documentation engine service (powered by KitDocs) is in services/kit-docs/
• the documentation is in docs/ (it is a relative symbolic link to services/kit-docs/src/routes/docs/