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/ni.svg

@@ -126,4 +126,4 @@
     <path fill="#fff" d="m550 324.6 4 .3 2.9.3-.4-.5c-.6.2-4.4-.2-6.4 0z"/>
   </g>
   <path fill="#c8a400" d="m320 179.9-25.7 44.5L268 270h104l-25.7-44.6zm0 2.4 25.2 43.7 24.7 42.8h-99.8l25.2-43.8z"/>
-</svg>
+</svg>