Add confirmation of the contact email

[SimonWallner]

migrated from old repo, original issue: localstack/localstack.github.io#143

Summary

It has occurred on several occasions where the user provided a contact email that contained a typographical error, resulting in our inability to contact them again.

Requirements

(I am open to exploring any alternative approaches to prevent individuals from providing incorrect emails.)

• After entering the contact email, users are prompted to confirm the email address by entering it a second time.
• The system compares the initial entry with the confirmation entry to ensure they match before proceeding.
• If the email addresses do not match or the format is incorrect, the system displays a clear error message.
• Users are provided with visual cues (such as green checkmarks or red X symbols) to indicate the validity of their entries.

Expected Behaviour

By preventing typographical errors and ensuring accurate email addresses, we can facilitate effective communication with users and prevent any inconvenience caused by mistyped email addresses.

Linked Issues

List any blockers or sub-tasks here

References

Contact page: https://localstack.cloud/contact/