Yoast SEO sitemap fix

This plugin addresses a technical error that can occur with the Yoast SEO plugin, specifically the "XML declaration allowed only at the start of the document" warning that prevents sitemaps from generating correctly. It is for site administrators and developers who encounter this specific sitemap failure and need a direct solution.

• Targeted Error Correction: The plugin specifically fixes the issue where extra whitespace or characters are output before the XML declaration in the sitemap, which is a strict parsing error.
• Lightweight Implementation: It works by hooking into the appropriate output buffer to ensure clean XML generation, without making changes to the Yoast SEO plugin's core files.
• Simple Installation: The fix is applied by uploading and activating the plugin through the standard admin interface, requiring no manual code editing for most users.
• Preserves SEO Functionality: By resolving the XML error, it allows the Yoast SEO sitemap to function as intended, ensuring search engines can properly crawl and index the site's content structure.