feat: Add Grafana integration page

[danielvallance]

No description provided.

[dosubot]

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[unikraft-bot]

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[Copilot]

Pull request overview

Adds a new Grafana integration documentation page (including a ready-to-import dashboard JSON) and wires it into the docs navigation, while updating the existing metrics docs to point readers to the new integration guidance.

Changes:

• Adds /integrations/grafana documentation, including Prometheus scrape configuration, dashboard import/provisioning steps, and alert rule examples.
• Adds a Grafana dashboard JSON export at public/grafana/vm-instances.json for download/import.
• Updates the metrics documentation (and navigation) to reference the Grafana integration page.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
zudoku.config.tsx	Adds the Grafana integration page to the Integrations navigation section.
public/grafana/vm-instances.json	Introduces a Grafana dashboard JSON for Unikraft Cloud VM instance metrics.
pages/platform/metrics.mdx	Updates metrics docs to mention scraping Prometheus format and links to the Grafana integration.
pages/integrations/grafana.mdx	New integration page describing Prometheus scraping + Grafana dashboard import/provisioning and alerting.

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