Updated remix content into react-router (#6488)

* fixed typo react-router instead of Remix

* Updated Remix to react-router in frontend roadmap

* Update src/data/roadmaps/frontend/frontend.json

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/frontend/content/react-router@KJRkrFZIihCUBrOf579EU.md

@@ -1,6 +1,6 @@
-# Remix
+# react-router
 
-Remix is a full stack web framework that lets you focus on the user interface and work back through web standards to deliver a fast, slick, and resilient user experience. People are gonna love using your stuff.
+There used to be Remix in this list but they announced to merge Remix into react-router after v7.
 
 Visit the following resources to learn more: