Fix Broken link to Backend Roadmap

[lilpolymath]

What is the URL where the issue is happening

https://roadmap.sh/typescript

What browsers are you seeing the problem on?

No response

Describe the Bug

On the Typescript roadmap page, when you try to visit the Backend Roadmap, you get redirected you to the React roadmap.

Output from browser console (if any)

None

Participation

• [X] I am willing to submit a pull request for this issue.