fix(email): change assets from .svg to .png and update mail titles and content

src/components/Tutorial/TutorialWelcome.tsx

src/notifications/base/footer.hbs

src/notifications/base/header.hbs

src/notifications/consumptionLimit.hbs

src/notifications/monthlyReport.hbs

src/notifications/style.hbs

src/notifications/welcome.hbs

src/services/environement.service.ts

src/targets/services/consumptionAlert.ts

src/targets/services/monthlyReportNotification.ts