Docs: Deprecate Starburst and Light Leaks packages

[JonnyBurger]

Summary

• simplify the Starburst guide and demo to use the default smoothness and origin
• animate one full rotation over the composition duration and double the demo length
• group @remotion/starburst and @remotion/light-leaks with deprecated packages in the API sidebar

Validation

• bun run build
• bun run stylecheck
• REMOTION_DOCS_LOW_MEMORY_BUILD=1 REMOTION_DOCS_BUILD_HEARTBEAT_MS=30000 bun run build-docs

Closes #9666

Preview

• Starburst guide

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 27, 2026 12:31pm
remotion	Ready	Preview, Comment	Jul 27, 2026 12:31pm

[pullfrog]

✅ No new issues found.

Reviewed changes — moves @remotion/starburst and @remotion/light-leaks sidebar entries into the deprecated packages section, and simplifies the Starburst demo and guide to use default smoothness and origin values with a full-rotation animation over durationInFrames.

• Simplify StarburstDemo and guide — removes explicit smoothness, origin, and hardcoded frame-range interpolation in favor of a single full rotation over durationInFrames using only rotation.
• Double demo duration — durationInFrames goes from 90 to 180 to match the longer animation.
• Reorganize sidebar — @remotion/light-leaks and @remotion/starburst are removed from their original sections and re-added under Deprecated Packages with (deprecated) labels, ordered correctly after @remotion/light-leaks and @remotion/media-parser.

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