Docs: Reorganize effects categories

[JonnyBurger]

Summary

• Reorganize the @remotion/effects docs table of contents into more canonical video effect categories.
• Split source-image stylization from procedural generated effects.
• Move light-based effects into a dedicated Light category.

Fixes #7828

Test plan

• bun run build
• bun run formatting

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	May 30, 2026 9:15am
remotion	Ready	Preview, Comment	May 30, 2026 9:15am

[pullfrog]

✅ No new issues found.

Reviewed changes — reorganization of the @remotion/effects documentation table of contents into more canonical video effect categories.

• Split "Generative" into "Stylize" and "Generate" — source-image stylization effects (dotGrid, halftone, lines, scanlines, speckle) are now grouped separately from procedural generation effects (halftoneLinearGradient, noise, whiteNoise).
• Add "Blur & Shadow" category — groups blur, dropShadow, and glow together.
• Add "Light" category — groups lightLeak, shine, starburst, and vignette together.
• Update effect descriptions — halftone() and halftoneLinearGradient() descriptions now clarify source-image vs. procedural semantics.

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