Summary

Update confirmation email template and email wrapper

• Closes #1279

Steps to test

• Go to review site
• Create a new account using a ProtonMail account
• Go to your ProtonMail inbox.
• Ensure the email looks acceptable with remote content disabled.
• Enable remote content
• Ensure it looks similar to the design at #1279. Note @brianhatchet's comment (#1279 (comment 278203292))
• Confirm your email. Refresh the page to ensure the banner went away.
• Go to menu > Settings > Email Notification
• Change your email address to a gmail.com based on
• Go to your GMail inbox
• Ensure the email looks acceptable with and/or without images enabled.
• Extra kudos for checking other email providers.

Estimated Regression Scope

• Confirmation email
• Confirmation email link to verify the account

added scoped label

mentioned in merge request front!755

changed title from WIP: Upe confirmation email template to WIP: Upe confirmation email template

changed the description