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/sg.svg

@@ -10,4 +10,4 @@
     <path fill="#fff" d="M146 40.2a84.4 84.4 0 0 0 .8 165.2 86 86 0 0 1-106.6-59 86 86 0 0 1 59-106c16-4.6 30.8-4.7 46.9-.2z"/>
     <path fill="#fff" d="m133 110 4.9 15-13-9.2-12.8 9.4 4.7-15.2-12.8-9.3 15.9-.2 5-15 5 15h15.8zm17.5 52 5 15.1-13-9.2-12.9 9.3 4.8-15.1-12.8-9.4 15.9-.1 4.9-15.1 5 15h16zm58.5-.4 4.9 15.2-13-9.3-12.8 9.3 4.7-15.1-12.8-9.3 15.9-.2 5-15 5 15h15.8zm17.4-51.6 4.9 15.1-13-9.2-12.8 9.3 4.8-15.1-12.9-9.4 16-.1 4.8-15.1 5 15h16zm-46.3-34.3 5 15.2-13-9.3-12.9 9.4 4.8-15.2-12.8-9.4 15.8-.1 5-15.1 5 15h16z"/>
   </g>
-</svg>
+</svg>