Add Gizmo Analytics provider

[sudomichael]

Summary

Adds Gizmo Analytics as a new provider in the Analytics component, following the same shape as the existing six (Plausible, Umami, Simple Analytics, Posthog, Google Analytics, Microsoft Clarity).

Gizmo is cookieless and GDPR-friendly — no cookies, no localStorage, no fingerprinting, no consent banner required under CNIL / EDPB guidance. Free tier is 10k events/month with unlimited sites, so it's a natural fit for static blogs / content sites using this kit.

Changes

• packages/pliny/src/analytics/Gizmo.tsx — single <Script> with data-key derived from the public site key (ak_public_…). src defaults to https://gizmoanalytics.io/script.js, overridable for self-host scenarios.
• packages/pliny/src/analytics/index.tsx — registered gizmoAnalytics in AnalyticsConfig, wired the conditional render in Analytics, re-exported Gizmo + GizmoProps.
• README.md — added Gizmo to the providers list.
• .changeset/add-gizmo-analytics.md — minor version bump.

Test plan

• yarn build succeeds (verified locally)
• No new dependencies
• Provider follows the same prop / src override pattern as Umami / Plausible

Usage example

const analytics: AnalyticsConfig = {
  gizmoAnalytics: {
    gizmoPublicKey: 'ak_public_…', // from gizmoanalytics.io site settings
  },
}

I'd be happy to follow up with a complementary PR against tailwind-nextjs-starter-blog to add the gizmoAnalytics block to data/siteMetadata.js once this is merged — let me know if you'd like that as a separate PR or bundled.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8bd6ace

The changes in this PR will be included in the next version bump.

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