fix: inconsistent session cookie (#1310)

.env.example

@@ -20,8 +20,6 @@ DB_URL='FULL_PATH_TO_YOUR_SQLITE_DB_FILE'
 # DB_PASSWORD='password'
 # DB_NAME='name-of-database'
 
-# @see https://next-auth.js.org/configuration/options#nextauth_url
-AUTH_URL='http://localhost:3000'
 
 # You can generate the secret via 'openssl rand -base64 32' on Unix
 # @see https://next-auth.js.org/configuration/options#secret