Nginx Ingress Controller: no need for default-backend

[JordanP]

Hi,
Since Nginx Ingress controller v0.21 and this commit [1], it's not required to have a default backend service anymore. I suggest you remove these lines [2] and also the default-backend folder. It will simplify the deployment a bit with one less piece of software.

[1] kubernetes/ingress-nginx@0bb5934#diff-b7d944663319ec93108dd9eb66df1d9d
[2] https://github.com/poseidon/typhoon/blob/master/addons/nginx-ingress/google-cloud/deployment.yaml#L30

[dghubble]

Nice 👍 And most important, Nginx is configured to serve the 404 on its own so the behavior remains the same.