Remove duplicate resource (#4375)

Remove resource hosting a duplicate of another listed resource.

src/data/roadmaps/frontend/content/100-internet/101-what-is-http.md

@@ -8,7 +8,6 @@ Visit the following resources to learn more:
 - [What is HTTP?](https://www.cloudflare.com/en-gb/learning/ddos/glossary/hypertext-transfer-protocol-http/)
 - [How HTTPS Works ...in a comic!](https://howhttps.works)
 - [An overview of HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview)
-- [Journey to HTTP/2](https://kamranahmed.info/blog/2016/08/13/http-in-depth)
 - [HTTP/3 From A To Z: Core Concepts](https://www.smashingmagazine.com/2021/08/http3-core-concepts-part1/)
 - [HTTP/3 Is Now a Standard: Why Use It and How to Get Started](https://thenewstack.io/http-3-is-now-a-standard-why-use-it-and-how-to-get-started/)
 - [HTTP Crash Course & Exploration](https://www.youtube.com/watch?v=iYM2zFP3Zn0)