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/sr.svg

@@ -3,4 +3,4 @@
   <path fill="#fff" d="M.1 96h640v288H.1z"/>
   <path fill="#b40a2d" d="M.1 144h640v192H.1z"/>
   <path fill="#ecc81d" d="m320 153.2 56.4 173.6-147.7-107.3h182.6L263.6 326.8z"/>
-</svg>
+</svg>