[$250] Email template for self-service

[jmgasper]

@atelomycterus - A couple more changes to the email template, solely for self-service notifications to Client Manager.

1. We'll remove the link for the challenge
2. We can remove the footer entirely.

[jmgasper]

Challenge https://www.topcoder.com/challenges/3dbd5885-79db-458d-ba04-0ec03a4e6a55 has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/3dbd5885-79db-458d-ba04-0ec03a4e6a55 has been assigned to obog.

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[atelomycterus]

@jmgasper Implemented with #670. See #670 (comment). Thanks!

[jmgasper]

Payment task has been updated: https://www.topcoder.com/challenges/3dbd5885-79db-458d-ba04-0ec03a4e6a55
Payments Complete
Winner: obog
Copilot: ghostar
Challenge 3dbd5885-79db-458d-ba04-0ec03a4e6a55 has been paid and closed.

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