Add profile link component and update styles

style(index.css): improve icon/text alignment and spacing

Refactor profile link from div wrapper to direct link element

Add profile link with external icon to index page

Update app icon for elapsed-times

Remove social media links from index page

Adjust dark foreground color for better contrast

2025-10-30-webrick-websocket-sse.ja.md を更新

Fixed: hljs not found error on Turbo navigation

Add syntax highlighting and improve code block styling

style: improve docs CSS styling and minor content updates

Reverse post order display

Add blog post about WebSocket and SSE implementation with WEBrick

Reduce profile section top margin from 8rem to 5rem

Fixed file name