docs(contributing): fix a broken link (#1594)

* docs(contributing): fix a broken link

* docs(contributing): fix a broken link

Co-authored-by: Nan Wang <nan.wang@jina.ai>

* chore: update CONTRIBUTING.md

Co-authored-by: Nan Wang <nan.wang@jina.ai>
Co-authored-by: Han Xiao <han.xiao@jina.ai>

CONTRIBUTING.md

@@ -27,7 +27,7 @@ In this guide we're going to go through the steps for each kind of contribution,
 <a name="-before-you-start"></a>
 ## 🏁 Before you Start
 
-Make sure you've read through our [README](https://github.com/jina-ai/jina), [Jina 101](./101/README.html), and [example tutorials](https://github.com/jina-ai/examples) so you have a good understanding of what Jina is and how it works.
+Make sure you've read through our [README](https://github.com/jina-ai/jina), [Jina 101](https://101.jina.ai), and [example tutorials](https://learn.jina.ai) so you have a good understanding of what Jina is and how it works.
 
 ### Not a coder but still want to contribute?