docs(system-design): fix moved NGINX architecture link (#10521)

The "Inside NGINX: How We Designed for Performance & Scale" link on
nginx.com now redirects to the F5 NGINX product page instead of the
article. The article now lives on the NGINX community blog, so point
both topics there.

roadmaps/system-design/content/lb-vs-reverse-proxy@ocdcbhHrwjJX0KWgmsOL6.md

@@ -5,6 +5,6 @@ A load balancer and a reverse proxy both sit in front of backend servers, but th
 Visit the following resources to learn more:
 
 - [@article@Reverse Proxy vs Load Balancer](https://www.nginx.com/resources/glossary/reverse-proxy-vs-load-balancer/)
-- [@article@NGINX Architecture](https://www.nginx.com/blog/inside-nginx-how-we-designed-for-performance-scale/)
+- [@article@NGINX Architecture](https://blog.nginx.org/blog/inside-nginx-how-we-designed-for-performance-scale)
 - [@article@HAProxy Architecture Guide](http://www.haproxy.org/download/1.2/doc/architecture.txt)
 - [@article@Reverse Proxy](https://en.wikipedia.org/wiki/Reverse_proxy)

roadmaps/system-design/content/load-balancers@14KqLKgh090Rb3MDwelWY.md

@@ -5,5 +5,5 @@ A load balancer distributes incoming traffic across multiple servers so no singl
 Visit the following resources to learn more:
 
 - [@article@Scalability](https://cs.fyi/guide/scalability-for-dummies)
-- [@article@NGINX Architecture](https://www.nginx.com/blog/inside-nginx-how-we-designed-for-performance-scale/)
+- [@article@NGINX Architecture](https://blog.nginx.org/blog/inside-nginx-how-we-designed-for-performance-scale)
 - [@article@HAProxy Architecture Guide](http://www.haproxy.org/download/1.2/doc/architecture.txt)