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/nf.svg

@@ -6,4 +6,4 @@
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     <path fill="#fff" stroke="#000" stroke-linejoin="round" stroke-width=".8" d="m280.3 328.7-.2 3.5s-6.2-1.8-8.2-5.3c3.6-1 8.5 1.9 8.4 1.8z"/>
   </g>
-</svg>
+</svg>