Clean up SVG files and update logos

- Removed unnecessary XML and DOCTYPE declarations from SVG files.
- Eliminated comments within SVG files for cleaner output.
- Trimmed leading and trailing whitespace from SVG content.
- Ensured all SVG files end with a newline character.
- Updated multiple logo SVG files including WireGuard, Wise, WOG, Yahoo, and others to conform to the new standards.
- Enhanced the update-data.js script to automate the cleanup process for SVG files.

public/images/flags/cg.svg

@@ -9,4 +9,4 @@
     <path fill="#00ca00" d="M-119.5 32v480l480-480z"/>
     <path fill="red" d="M120.5 512h480V32z"/>
   </g>
-</svg>
+</svg>