Add Community Update blog post for v0.10.1 release

[Copilot]

This PR adds a comprehensive community update blog post highlighting the key features, improvements, and bug fixes introduced in JSAR Runtime v0.10.1.

What's Added

New Blog Post: docs/blogs/community-update-v0-10-1.md

• 119-line comprehensive coverage of v0.10.1 release highlights
• Detailed technical explanations of 3 key features with implementation details and developer impact
• Structured for both technical and non-technical community audiences
• Includes practical code examples demonstrating new capabilities

Updated Blog Index: docs/blog.md

• Added the new community update to the "Latest Posts" section
• Maintains chronological ordering with proper metadata

Key Features Highlighted

1. Parallel Web Content Rendering

Deep dive into the std::async implementation that enables each web content instance to render in its own thread, dramatically improving performance for complex spatial interfaces with multiple content areas.

2. Advanced CSS Selector Support

Comprehensive coverage of newly implemented CSS selectors including:

• CSS nth-child() and nth-of-type() selectors
• CSS Variables support for dynamic theming
• Universal selector (*) and pseudo-class selectors (:root, :where())
• Attribute selectors for content-based styling

3. Enhanced Canvas 2D API

Coverage of strokeRect() method implementation and ongoing efforts to achieve full Canvas 2D API compatibility for graphics libraries and charting solutions.

Content Structure

The blog post includes:

• Technical implementation details explaining what changed and why it matters
• Performance impact analysis with concrete benefits for XR applications
• Practical code examples showcasing new CSS selector capabilities
• Cross-references to detailed changelog and internal technical documentation
• Quick start guide with working examples

This content provides valuable insights for web developers transitioning to XR development, XR application developers requiring complex UI capabilities, and framework developers building spatial web component libraries.

Fixes #341.

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