Consider generating csv based on md (instead of vice versa)

For contributors, it would be easier to have pages which directly link to editing on framagit.org. As stated on https://linuxphoneapps.org/docs/contributing/edit-csv-in-libreoffice/, the csv is mainly used as input data for third party.

Therefore, I propose to keep the source in md and have a small script which collects all md's in one csv and exposes that (via CI).