Update 100-horizontal-vs-vertical-scaling.md

The previous URL redirects to a whole different website which has nothing related to the topic.

src/data/roadmaps/computer-science/content/116-system-design/100-horizontal-vs-vertical-scaling.md

@@ -4,6 +4,6 @@ Horizontal scaling is the process of adding more machines to your system. This i
 
 Visit the following resources to learn more:
 
-- [Scaling Horizontally vs. Scaling Vertically](https://www.section.io/blog/scaling-horizontally-vs-vertically/)
+- [Scaling Horizontally vs. Scaling Vertically](https://www.digitalocean.com/resources/article/horizontal-scaling-vs-vertical-scaling)
 - [System Design Basics: Horizontal vs. Vertical Scaling](https://www.youtube.com/watch?v=xpDnVSmNFX0)
 - [Vertical vs. Horizontal Scaling for Database Servers](https://www.youtube.com/watch?v=R99R-SNbo9g)