📖 Update kubestellar-mcp docs to v0.8.21

[clubanderson]

Summary

Automated update for kubestellar-mcp release v0.8.21.

• Created branch: docs/kubestellar-mcp/0.8.21
• Source: kubestellar/kubestellar-mcp@v0.8.21

Checklist

• Verify branch deploys correctly on Netlify
• Verify version appears in dropdown

🤖 Generated automatically on release

[clubanderson]

/lgtm
/approve

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[kubestellar-prow]

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[Copilot]

Pull request overview

This PR updates the KubeStellar MCP documentation version configuration to mark v0.8.21 as the latest release while preserving v0.8.20 as a selectable historical version.

Changes:

• Updated KubeStellar MCP latest label and branch to v0.8.21.
• Added v0.8.20 as a non-default version entry.
• Updated KubeStellar MCP currentVersion and shared config timestamp.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/config/versions.ts	Updates static KubeStellar MCP version metadata to v0.8.21.
public/config/shared.json	Updates shared runtime config for KubeStellar MCP version selection.

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