feat(newsletter): Added new image and styles

1. Added section "Un problème ? [...]" below monthly report mail : https://www.figma.com/file/SD23ynpp1V7Hj9Ax21Y7LZ/LLLE-Mobile-(Metropole)?node-id=8796%3A45698
2. Change mail object, remove dash after "[Ecolyo]' and mention last month (ex : "[Ecolyo] Votre bilan de novembre 2021")
3. Show fluid consumptions as a list
4. Center "Voir mon bilan" text in button
5. Changes related to this sketch : https://www.figma.com/file/MiXXGdDuiSNmuSbZAavVTz/LLLE-Mobile?node-id=12097%3A71724