[BUG] EMail templates have wrong image src

[Tymmmy]

Steps to reproduce

1. Generate either 'verify your email' email or 'forgotten password' email.
2. Check the emails, and see that the images are not correctly loaded

Expected result

All images in emails should be correctly loaded and displayed.

Actual result

The Problem is that the image sources use branch names, and not the main branch name, so when the branch got deleted, the images are no longer available. For example:

Wrong src path: https://raw.githubusercontent.com/interledger/testnet/1387-test-wallet-new-design-authkyc-pages/packages/wallet/backend/src/email/templates/images/InterledgerTestWallet.png

Correct src path: https://raw.githubusercontent.com/interledger/testnet/main/packages/wallet/backend/src/email/templates/images/InterledgerTestWallet.png

Screenshots or videos

No response

Additional context

ToDo

• [ ] verify all email templates and check image src paths
• [ ] replace image src paths to point to main images

Operating system

macOS

Operating system version

No response

Browsers

Chrome

Browser version

No response