Remove Environment Variable AUTH_URL

[dexhowl]

Upon completing Chapter 15 I received this warning. [auth][warn][env-url-basepath-redundant] Read more: https://warnings.authjs.dev#env-url-basepath-redundant

After investigating a little I found that Auth.js version 5 infers AUTH_URL automatically based on request headers and has defined this environment variable as mostly unnecessary.

AUTH_URL This environment variable is mostly unnecessary with v5 as the host is inferred from the request headers. However, if you are >using a different base path, you can set this environment variable as well. For example, AUTH_URL=http://localhost:3000/web/>auth or AUTH_URL=https://company.com/app1/auth

Getting rid of this line from my .env file removes the warning and everything still works like normal when logging in/out.

I'm hoping that removing it from the example file will prevent others from going through the same confusion I did with this problem.

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