Added base url to.env.example

.env.example

@@ -1,6 +1,6 @@
 DATABASE_URL='postgresql://<user>:<pass>@<db-host>:<db-port>/<db-name>'
 GOOGLE_API_CREDENTIALS='secret'
-NEXTAUTH_URL='http://localhost:3000'
+BASE_URL='http://localhost:3000'
 
 # Remove this var if you don't want Calendso to collect anonymous usage
 NEXT_PUBLIC_TELEMETRY_KEY=js.2pvs2bbpqq1zxna97wcml.oi2jzirnbj1ev4tc57c5r