Add PageGuard - free all-in-one website health scanner

Author: PageGuard Bot

readme.md

@@ -169,6 +169,7 @@ A helpful checklist / collection of Search Engine Optimization (SEO) tips and te
 - [WooRank](https://www.woorank.com/) - WooRank will help you to address issues on your site & identify opportunities to push you ahead of the competition.
 - [Awesometechstack.com](https://awesometechstack.com/) - AwesomeTechStack provides insights into the security, modernity, and performance of any website's technology stack and guidance to improve web vitals and the technology stack.
 - [OptimalUX](https://optimalux.com/seo-patching) - Optimize your site with seamless SEO patching and an A/B testing tool built on top of Cloudflare for easy integration. 
+- [PageGuard](https://pageguard.org) - Free website health scanner with SEO analysis, performance testing, accessibility audit, and AI-generated action plans.
 
 ### Keywords