Docs: use archive link for deleted GitOps blog post

[birjj]

Description of your changes

This updates the link to the weave.works blog post, so it now points to an archived version (using archive.org). The blog post is currently linked in https://kubevela.io/docs/case-studies/gitops/, but the destination domain seems to have been taken over and now redirects to a thai gambling site.

Screen record of current state:

Screen.Recording.2026-03-17.at.16.41.28.mov

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I have:

• Read and followed KubeVela's contribution process.
• Update sidebar.js if adding a new page.
• Run yarn start to ensure the changes has taken effect.

Special notes for your reviewer

I've taken the most recent link from archive.org that I could find for the used URL.

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Summary by cubic

Replaced the GitOps blog reference with a Wayback Machine snapshot to fix the broken weave.works link. This prevents a spam redirect and keeps the docs accurate.

^{Written for commit 0122794. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

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