Documentation Enhancement

[kocheck]

Overview

This PR adds comprehensive documentation to the project, focusing on advanced configuration options, development guidelines, and technical specifications.

Changes

• Added detailed theme configuration documentation including light/dark theme support
• Documented performance optimizations (Service Worker, Image Optimization)
• Added typography system documentation with responsive font scaling details
• Included page transition implementation guidelines
• Added accessibility features documentation (WCAG 2.1 compliance, keyboard navigation)
• Documented development scripts and security headers
• Added component guidelines for images and content layout
• Included browser support matrix
• Added testing instructions for contrast, HTML validation, and performance

Technical Details

• Added documentation for CSS custom properties for theming
• Included code references for key implementation files:
  • Service Worker (static/sw.js)
  • Typography system (assets/scss/base/_typography.scss)
  • Page transitions (assets/js/transition.js)
  • Image components (assets/scss/components/_image.scss)
  • Content layout (assets/scss/layout/_content.scss)

Testing Instructions

Documentation includes commands for running:

• Contrast tests: npm run test:contrast
• HTML validation: npm run test:html
• Performance checks: npm run lighthouse

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