Passage à OTP 23 et amélioration de l'image transport #22
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Je suis en train de mettre à jour OTP de 22 à 23 (etalab/transport-site#1590), et je souhaite faire cela sans mettre à jour Elixir (mise à jour qui nécessitera, elle, davantage de travail).
Comme expliqué dans #21, je bascule l'image de base de https://hub.docker.com/_/elixir vers https://github.com/hexpm/bob#docker-images, car ces dernières me permettent de décider quelle version d'OTP je souhaite, et d'upgrader ainsi uniquement OTP et pas Elixir.
Par ailleurs je remplace une compilation de iconv par l'installation d'un package, et j'améliore la documentation.