Add GitHub Actions workflow for documentation build

[abernier]

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Latest commit: b502339

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[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit b502339:

Sandbox	Source
leva-minimal	Configuration
leva-busy	Configuration
leva-scroll	Configuration
leva-advanced-panels	Configuration
leva-ui	Configuration
leva-theme	Configuration
leva-transient	Configuration
leva-plugin-plot	Configuration
leva-plugin-bezier	Configuration
leva-plugin-spring	Configuration
leva-plugin-dates	Configuration
leva-custom-plugin	Configuration

[Copilot]

Pull Request Overview

This PR adds a GitHub Actions workflow to build and deploy documentation to GitHub Pages for the leva library.

• Introduces automated documentation deployment workflow triggered on pushes to main branch
• Configures build job using pmndrs/docs reusable workflow with leva-specific settings
• Sets up deployment job with appropriate GitHub Pages permissions and environment configuration

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