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Links:
- https://www.smashingmagazine.com/2018/04/vuejs-firebase-firestore/
- https://medium.freecodecamp.org/rtdb-to-firestore-fd8da8149877 : on switching from old real time database to the new firestore
- https://medium.freecodecamp.org/authentication-with-vue-js-firebase-5c3a82149f66
- https://gist.github.com/mickaelandrieu/a66bdf031a3c5fa4caf301504f018904 : vue.js + firebase auth