chore(deps): update docs from repo source

[kumahq[bot]]

Syncing docs from source code.

Generated by action

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[Icarus9913]

Met a failure with link checker, we need to re-run it.

https://deploy-preview-1812--kuma.netlify.app/docs/2.7.x/networking/dns/
    lookup coredns.io: i/o timeout  https://coredns.io/manual/toc/
https://deploy-preview-1812--kuma.netlify.app/docs/2.0.x/networking/dns/
    lookup coredns.io: i/o timeout  https://coredns.io/manual/toc/

[Icarus9913]

What's more, the version 2.8.0 docs got 404

[lukidzi]

Looks like there is no docs_nav_kuma_2.8.x.yml yet. Maybe it's published after pushing tag

[lukidzi]

I had to copy dev and rename to 2.8.x. I am not sure why we need to do it manually. To fix