use nodemailer instead of sendgrid

package.json

@@ -12,7 +12,6 @@
   },
   "dependencies": {
     "@next-auth/mongodb-adapter": "1.1.1",
-    "@sendgrid/mail": "7.7.0",
     "@vercel/analytics": "^0.1.4",
     "autoprefixer": "10.4.13",
     "classnames": "2.3.2",
@@ -25,13 +24,14 @@
     "next-auth": "4.18.7",
     "next-axiom": "0.16.0",
     "next-mdx-remote": "4.2.0",
-    "nodemailer": "6.8.0",
+    "nodemailer": "^6.8.0",
     "react": "18.2.0",
     "react-calendar": "4.0.0",
     "react-dom": "18.2.0",
     "uuid": "9.0.0"
   },
   "devDependencies": {
+    "@types/nodemailer": "^6.4.6",
     "@types/react": "18.0.26",
     "@types/react-calendar": "3.9.0",
     "@types/uuid": "8.3.4",
@@ -52,4 +52,4 @@
       "^.+\\.(ts|tsx)$": "ts-jest"
     }
   }
-}
+}