feat(site): remove style from urls

[decepulis]

closes #377

Summary

• Remove style parameter from doc URLs (e.g., /docs/framework/html/style/css/... → /docs/framework/html/...)
• Move style preference to localStorage per-framework (vjs_docs_style_html, vjs_docs_style_react)
• Add StyleInit.astro to read localStorage before paint and set html[data-style] attribute
• Use CSS [data-for-style] selectors for content visibility instead of server-side filtering

Test plan

• Visit docs at /docs/framework/html/how-to/installation — page renders without style in URL
• Toggle style selector — content updates instantly without navigation
• Refresh page — style preference persists from localStorage
• Switch frameworks — each framework remembers its own style preference
• Old URLs with /style/ segment should 404 (no backwards-compat redirects)

🤖 Generated with https://claude.com/claude-code

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Project	Deployment	Actions	Updated (UTC)
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