feat: remove defer (#243)

* working on moving the email logic to the backend

* Moved nodemailer to the backend

* uninstall defer

* updated relative import path in tsconfig

* working on the zod validation

* Merge branch 'main' into send-email

* fixed the zod import issue

* fixed the zod import issue

* updated the env example files

* docs: update README.md (#249)

* fix: handle catex error

* chore: remove fly.io github action

* Update README.md

Updated the Readme to reflect changes made to the emailing flow

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

* chore: wrapp up email sending

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

apps/backend/.env.example

@@ -13,3 +13,10 @@ CLOUDFLARE_PUBLIC_ACCOUNT_ID=
 MUSE_API_KEY=
 REDIS_API_KEY=
 TELEGRAM_BOT_TOKEN=
+
+SMTP_HOST=
+SMTP_USER=
+SMTP_PASSWORD=
+SMTP_USER_NOTIFY=
+SMTP_PASSWORD_NOTIFY=
+SMTP_PORT=