Roadmap for 4.0

[do4ng]

We will be conducting a major update to revitalize development

Roadmap

• improve export-default - improve export-default #402 (canceled)
• JSX support - JSX support #403
• improving performance
• webpack loader (replaced with Serpack #444)
• support .html - Support .html #404
• Integrating multiple packages - Integrating multiple packages #406
• createFrontendPage() - createFrontendPage() #224