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/de.svg

@@ -2,4 +2,4 @@
   <path fill="#fc0" d="M0 320h640v160H0z"/>
   <path fill="#000001" d="M0 0h640v160H0z"/>
   <path fill="red" d="M0 160h640v160H0z"/>
-</svg>
+</svg>