Removed nodemailer from backend

ref #151

package.json

@@ -37,7 +37,6 @@
     "jsonwebtoken": "^8.5.1",
     "libphonenumber-js": "^1.9.9",
     "mysql": "^2.18.1",
-    "nodemailer": "^6.4.17",
     "pg": "^8.5.1",
     "reflect-metadata": "^0.1.13",
     "routing-controllers": "0.9.0-alpha.6",
@@ -57,7 +56,6 @@
     "@types/jest": "^26.0.20",
     "@types/jsonwebtoken": "^8.5.0",
     "@types/node": "^14.14.22",
-    "@types/nodemailer": "^6.4.0",
     "@types/uuid": "^8.3.0",
     "axios": "^0.21.1",
     "cp-cli": "^2.0.0",