Update seo-performance.md

Author: Meatball1601

docs/seo-performance.md

@@ -156,8 +156,3 @@ Sitemap: https://open-hardware-initiative.com/sitemap.xml
 - [TinyPNG](https://tinypng.com/) - Image compression
 - [Squoosh](https://squoosh.app/) - Advanced image optimization
 - [WebP Converter](https://convertio.co/webp-converter/) - Convert to WebP
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-**Last Updated**: December 2024  
-**Maintained by**: Open Hardware Initiative Development Team