📖 WIP: docs: configure redirects to work from any host on which the site is running

[joelanford]

This PR also attempts to fix the ongoing issues with redirects that fail for kubebuilder artifact downloads.

[k8s-ci-robot]

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[estroz]

@joelanford did this recently break? setup-envtest still seems to work fine.

[joelanford]

It's still failing for me:

$ curl -sSL -D - https://go.kubebuilder.io/dl/2.3.2/linux/amd64 -o /dev/null

HTTP/2 301
cache-control: public, max-age=0, must-revalidate
content-length: 68
content-type: text/plain; charset=utf-8
date: Mon, 30 Aug 2021 19:41:34 GMT
x-nf-request-id: 01FEC99KK7HMF9C9REGWN9627R
age: 0
location: https://go.kubebuilder.io/releases/2.3.2/linux/amd64
server: Netlify

HTTP/2 404
cache-control: public, max-age=0, must-revalidate
content-type: text/html; charset=utf-8
date: Mon, 30 Aug 2021 19:41:34 GMT
etag: 1546572965-ssl
server: Netlify
age: 0
x-nf-request-id: 01FEC99KP1K41NXZ474M54HH42

[joelanford]

Closed by #2321