docs(scripting): shaders

[lancesnider]

Adds documentation for shaders and script settings.

[Copilot]

Pull request overview

Adds a new documentation page introducing WGSL shaders in Rive (with a basic fullscreen-triangle WGSL example and a Lua rendering example) and wires the page into the Scripting docs navigation.

Changes:

• Add new scripting/wgsl-shaders.mdx page covering shader concepts, authoring, and rendering via GPUCanvas/GPUPipeline.
• Add the new page to the Scripting navigation in docs.json.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripting/wgsl-shaders.mdx	New MDX documentation page for WGSL shaders, including examples and editor configuration notes.
docs.json	Adds the WGSL shaders doc page to the Scripting section navigation.

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Project	Status	Preview	Updated (UTC)
rive	🟢 Ready	View Preview	Jul 8, 2026, 11:36 PM

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[lancesnider]

@luigi-rosso I put this under Protocols (Script Types), but shaders aren't a protocol. I'm wondering if I should put shaders, util scripts, and tests somewhere else.