docs(analytics): a banner for the repository preview and the launch post

[danielmlr]

Adds a banner for the analytics plugin: the image for the launch post and for the repository's social preview.

Changes

• packages/analytics/images/banner.source.html: the source. Eisbachcode's design (tokens, waves and mark from eisbachcode.de) with EmDash's gradient on one wave and its mark in the label. The card shows analytics-page.png from the same folder. The render command is in the file's header comment.
• packages/analytics/images/banner.png: rendered at 2560×1280 (1280×640 at 2x), 276 KB.

Neither file ships. The npm package contains only dist and emdash-plugin.jsonc, and the registry bundle takes the README, icon.png and a folder named screenshots/, not images/ (packages/plugin-cli/src/bundle/api.ts at emdash@1.0.1). The banner is not declared as a listing image, and it would exceed the 128 KB limit for one.

Satoshi loads from the Fontshare CDN in the source instead of being committed, because its licence does not allow redistributing the font files.

No changeset: no published file changes.

After merge

Set the banner as the social preview under Settings → General → Social preview.

[changeset-bot]

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Latest commit: d32b8ad

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