Fix README logo to use proper Markdown syntax instead of HTML

- Changed logo inclusion from HTML img tag to Markdown image syntax
- Removed HTML alignment and sizing attributes
- Now uses standard Markdown: ![WebSocket SSH Logo](logos/logo-256.png)
- Maintains clean Markdown formatting throughout the document

README.md

 # WebSocket SSH (wsssh)
 
-<img src="logos/logo-256.png" alt="WebSocket SSH Logo" width="128" height="128" align="right">
+![WebSocket SSH Logo](logos/logo-256.png)
 
 A modern SSH tunneling system that uses WebSocket connections to securely route SSH/SCP traffic through registered client machines. This allows you to access remote servers through intermediate "jump hosts" using WebSocket-based tunnels.