Email refactor

[carolhe134]

What I've Done

• In email/email.ts, I changed replaceAll to replace because replaceAll cannot be used anymore
• I moved the email folder from the pages/api directory to the root directory for security reasons
• For each file in email/templates folder, I moved the HTML string from Message.Body.Html.Data into the email/html folder in an HTML file with the corresponding name. See here for more info about how I did this
• I placed the helper functions from the linked article in the email/utils.ts file
• I updated the API calls in pages/api to use await when using the email templates
• I updated the website to remind applicant to check spam and quarantine for emails

Current Email Folder Structure

Proof that the HTML content is now colorful

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Name	Status	Preview	Comments	Updated (UTC)
witness	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 16, 2023 10:14pm

[zineanteoh]

@carolhe134 can I just say, your PR description is 💯.
super clear and easy to understand!!
thanks for the great work!! LGTM