[docs] Recommended resources page has 404 link

[rithik56]

Related page

https://mui.com/material-ui/getting-started/learn/

Kind of issue

Missing information

Issue description

When I click on The Smart Devpreneur link under Free section of recommended resources, the link is not working.

Context

We need to replace it with actual working link to make the documentation better

Search keywords: Docs Typo

[mj12albert]

Actually many of these links are outdated, maybe we should drop this whole section for now @mapache-salvaje