fix(email): missing assets for email rendering + switch link to remote doctype

src/assets/icons/email/ecolyo-icon.png

src/assets/icons/email/logo-gouv.png

src/assets/icons/email/logo-grandlyon.png

src/assets/icons/email/logo-territoire.png

src/assets/icons/email/logo-tiga-white.png

src/notifications/consumptionLimit.hbs

src/notifications/welcome.hbs

src/services/environement.service.ts

src/targets/services/monthlyReportNotification.ts