Redirect docs subdomain

[chance19]

The config in the previous PR did not work, this PR will

• Remove the config applied with Adding Netlify redirect config for legacy docs url #736
• Add redirect config to _redirects file in order to remain consistent with existing redirects

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[wallrj]

/lgtm
/approve

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[munnerz]

Hm I think this has happened after I deleted the old readthedocs site - that site was serving redirects from old config to the new pages.

Given those aren't 1:1 either (some content was re-organised) we may want to consider porting across the old rules... I'll see if I can dig them out!

[munnerz]

Here is the full list: https://github.com/jetstack/cert-manager/blob/release-0.12/docs/external_redirects

[munnerz]

Which may also want integrating with this: https://github.com/jetstack/cert-manager/blob/release-0.12/docs/redirects for completeness..

[munnerz]

Will this retain the trailing path segments so they go to the correct page?

[mattbates]

It won't - we need to add the :splat to the redirected URL.

[munnerz]

The issue is also that we re-mapped the URLs when moving too I think, see https://github.com/jetstack/cert-manager/blob/release-0.12/docs/redirects

[munnerz]

We could set up a small webservice that just serves 301 redirects to fix this up perhaps?

[maelvls]

Good idea.

Should we map all the URLs found on Google? E.g.,

https://docs.cert-manager.io/en/release-0.9/reference/issuers.html maps to https://cert-manager.io/docs/concepts/issuer/?

I did a quick google search, here are the existing links:

https://docs.cert-manager.io/en/release-0.11
https://docs.cert-manager.io/en/release-0.8/
https://docs.cert-manager.io/en/release-0.10/
https://docs.cert-manager.io/en/release-0.9/
https://docs.cert-manager.io/en/release-0.7/
https://docs.cert-manager.io/_/downloads/en/release-0.7/pdf/
https://docs.cert-manager.io/_/downloads/en/release-0.9/pdf/
https://docs.cert-manager.io/en/release-0.9/reference/issuers.html
https://docs.cert-manager.io/en/release-0.11/reference/challenges.html
https://docs.cert-manager.io/_/downloads/en/release-0.10/pdf/
https://docs.cert-manager.io/_/downloads/en/release-0.10/pdf/
https://docs.cert-manager.io/en/release-0.11/reference/certificates.html
https://docs.cert-manager.io/en/release-0.8/reference/orders.html
https://docs.cert-manager.io/en/release-0.11/reference/certificaterequests.html
https://docs.cert-manager.io/en/release-0.9/reference/orders.html
https://docs.cert-manager.io/en/release-0.9/getting-started/webhook.html
https://docs.cert-manager.io/en/release-0.8/reference/clusterissuers.html
https://docs.cert-manager.io/en/release-0.11/reference/clusterissuers.html
https://docs.cert-manager.io/en/release-0.11/getting-started/webhook.html
https://docs.cert-manager.io/en/release-0.7/getting-started/troubleshooting.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/index.html
https://docs.cert-manager.io/en/release-0.7/getting-started/install.html
https://docs.cert-manager.io/en/release-0.11/tasks/issuers/index.html
https://docs.cert-manager.io/en/release-0.10/tasks/issuers/index.html
https://docs.cert-manager.io/en/release-0.9/devel/dns01-providers.html
https://docs.cert-manager.io/en/release-0.11/reference/cainjector.html
https://docs.cert-manager.io/en/release-0.11/reference/api-docs/index.html
https://docs.cert-manager.io/en/release-0.9/reference/api-docs/index.html
https://docs.cert-manager.io/en/release-0.9/tasks/issuers/setup-ca.html
https://docs.cert-manager.io/en/release-0.11/tasks/issuers/setup-ca.html
https://docs.cert-manager.io/en/release-0.10/getting-started/install/kubernetes.html
https://docs.cert-manager.io/en/release-0.7/reference/api-docs/index.html
https://docs.cert-manager.io/en/release-0.11/getting-started/install/kubernetes.html
https://docs.cert-manager.io/en/release-0.8/reference/api-docs/index.html
https://docs.cert-manager.io/en/release-0.9/getting-started/index.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/issuing-certificates.html
https://docs.cert-manager.io/en/release-0.7/tasks/issuing-certificates/index.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-ca.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-vault.html
https://docs.cert-manager.io/en/release-0.7/tasks/issuers/setup-vault.html
https://docs.cert-manager.io/en/release-0.11/tasks/issuers/setup-vault.html
https://docs.cert-manager.io/en/release-0.10/devel/develop-with-minikube.html
https://docs.cert-manager.io/en/release-0.11/devel/develop-with-minikube.html
https://docs.cert-manager.io/en/release-0.7/tasks/issuers/setup-ca.html
https://docs.cert-manager.io/en/release-0.7/devel/develop-with-minikube.html
https://docs.cert-manager.io/en/release-0.11/tutorials/acme/index.html
https://docs.cert-manager.io/en/release-0.8/devel/develop-with-minikube.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/configuring-http01.html
https://docs.cert-manager.io/en/release-0.11/tasks/issuers/setup-acme/index.html
https://docs.cert-manager.io/en/release-0.11/tasks/uninstall/index.html
https://docs.cert-manager.io/en/release-0.11/tasks/backup-restore-crds.html
https://docs.cert-manager.io/en/release-0.7/tasks/issuing-certificates/ingress-shim.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/configuring-dns01/google.html
https://docs.cert-manager.io/en/release-0.7/tasks/issuers/setup-selfsigned.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuing-certificates/ingress-shim.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-acme/index.html
https://docs.cert-manager.io/en/release-0.9/tasks/acme/configuring-dns01/google.html
https://docs.cert-manager.io/en/release-0.10/tasks/acme/configuring-dns01/azuredns.html
https://docs.cert-manager.io/en/release-0.10/tasks/issuing-certificates/ingress-shim.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-selfsigned.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/configuring-dns01/azuredns.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/configuring-dns01/index.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/configuring-dns01/route53.html
https://docs.cert-manager.io/en/release-0.11/getting-started/install/index.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-acme/dns01/google.html
https://docs.cert-manager.io/en/release-0.10/tasks/issuers/setup-acme/dns01/google.html
https://docs.cert-manager.io/en/release-0.9/tasks/acme/configuring-dns01/cloudflare.html
https://docs.cert-manager.io/en/release-0.7/tasks/acme/debugging-failing-orders.html
https://docs.cert-manager.io/en/release-0.9/tasks/acme/configuring-dns01/route53.html
https://docs.cert-manager.io/en/release-0.9/tasks/acme/configuring-dns01/digitalocean.html
https://docs.cert-manager.io/en/release-0.11/tasks/issuers/setup-acme/dns01/azuredns.html
https://docs.cert-manager.io/en/release-0.8/tasks/issuers/setup-acme/dns01/route53.html
https://docs.cert-manager.io/en/release-0.9/tasks/issuers/setup-acme/dns01/akamai.html

🔎 Reproduce

1. get a key at https://developers.google.com/custom-search/v1/overview
2. Google a Search Engine ID (cx) at https://programmablesearchengine.google.com/controlpanel/all
3. Run:

for i in $(seq 0 10 100); do curl -s "https://customsearch.googleapis.com/customsearch/v1?key=$(lpass show -p google-search)&cx=$(lpass show -u google-search)&start=$i&q=site%3Adocs.cert-manager.io" | jq -r '.items[].link'; done