Broken links on FinRL Read The Docs: First Glance

**Describe the bug**
https://github.com/AI4Finance-Foundation/FinRL/tree/master/tutorials/1-Introduction

**To Reproduce**
That link does not work.

It is on Page 2 of the FinRL ReadTheDocs at

https://finrl.readthedocs.io/en/latest/start/first_glance.html

Similarly, the Google Colab link fails because of the same 404.
**Expected behavior**
Links should work.