ci(checklinks): exclude external website from checklinks

[Icarus9913]

I got some checklinks failure but it did works from my PC:

https://deploy-preview-2114--kuma.netlify.app/docs/2.9.x/production/dp-config/cni/
	403	https://docs.cilium.io/en/v1.14/operations/upgrade/#id2
https://deploy-preview-2114--kuma.netlify.app/docs/2.9.x/production/cp-deployment/kubernetes/
	403	https://argo-cd.readthedocs.io/en/stable/
https://deploy-preview-2114--kuma.netlify.app/docs/2.7.x/production/dp-config/cni/
	403	https://docs.cilium.io/en/v1.14/operations/upgrade/#id2
https://deploy-preview-2114--kuma.netlify.app/docs/2.7.x/production/cp-deployment/kubernetes/
	403	https://argo-cd.readthedocs.io/en/stable/
https://deploy-preview-2114--kuma.netlify.app/docs/2.8.x/production/dp-config/cni/
	403	https://docs.cilium.io/en/v1.14/operations/upgrade/#id2
https://deploy-preview-2114--kuma.netlify.app/docs/2.8.x/production/cp-deployment/kubernetes/
	403	https://argo-cd.readthedocs.io/en/stable/
Error: Process completed with exit code 1.

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[slonka]

In some cases it makes sense to exclude external sites, in some cases it does not. Here we're linking to docs of argo an cilium which makes sense to monitor if they did not change the structure or something. I can reach https://docs.cilium.io/en/v1.14/operations/upgrade/#id2 so it seems that we've been blocked somehow. Let's try to fix the 403 instead of just removing everything.

Possible solutions:

• run our link checker via a proxy
• if we don't want to check live sites then maybe we should somehow "cache" the external websites on build and display them from the cache 🤷