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/cu.svg

@@ -10,4 +10,4 @@
     <path fill="#cb1515" d="m-32 0 440.7 255.7L-32 511z"/>
     <path fill="#fff" d="M161.8 325.5 114.3 290l-47.2 35.8 17.6-58.1-47.2-36 58.3-.4 18.1-58 18.5 57.8 58.3.1-46.9 36.3z"/>
   </g>
-</svg>
+</svg>