Now that both chrome and firefox understand *.localhost domains we can
remove our suggestion of using localtest.me subdomains.
Also update the brew install instructions now that brew cask install
is deprecated in favor of brew install --cask
My favorite improvement is finding a way to use yaml block labels and
references to reduce the duplication in the ingress config.
I suppose the last important thing to mention about this changes is
that k3d seems to have switched from traefik to nginx for its ingress
loadbalancer. We no longer need the traefik annotation.