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/package.json

@@ -22,6 +22,7 @@
     "@aws-sdk/client-s3": "^3.388.0",
     "@aws-sdk/lib-storage": "^3.535.0",
     "@supabase/supabase-js": "^2.32.0",
+    "@types/nodemailer": "^6.4.11",
     "axios": "^1.4.0",
     "body-parser": "^1.20.2",
     "bull": "^4.11.3",
@@ -33,6 +34,7 @@
     "katex": "^0.16.10",
     "marked": "^7.0.3",
     "multer": "^1.4.3",
+    "nodemailer": "^6.9.5",
     "nodemon": "^3.0.1",
     "puppeteer": "^20.9.0",
     "zod": "^3.21.4"