Hotfix: add button to master readme (#849)

README.md

@@ -1,10 +1,6 @@
 <p align="center">
     <!-- community badges -->
     <a href="https://discord.gg/uMbNqcraFc"><img src="https://img.shields.io/badge/Join-Discord-blue.svg"/></a>
-    <!-- Colab Badges -->
-    <a href='https://colab.research.google.com/drive/13ZUOVo9N4fjZcoS_R9N0BsYa2kV6ywuq?usp=sharing'>
-        <img src='https://colab.research.google.com/assets/colab-badge.svg'
-        alt='Nerfstudio Colab' />
     <!-- doc badges -->
     <a href='https://plenoptix-nerfstudio.readthedocs-hosted.com/en/latest/?badge=latest'>
         <img src='https://readthedocs.com/projects/plenoptix-nerfstudio/badge/?version=latest' alt='Documentation Status' />
@@ -46,6 +42,9 @@
     <a href="https://viewer.nerf.studio/">
         <img alt="viewer" src="https://user-images.githubusercontent.com/3310961/194022636-a9efb85a-14fd-4002-8ed4-4ca434898b5a.png" width="150">
     </a>
+    <a href="https://colab.research.google.com/drive/13ZUOVo9N4fjZcoS_R9N0BsYa2kV6ywuq?usp=sharing">
+        <img alt="colab" src="https://raw.githubusercontent.com/nerfstudio-project/nerfstudio/main/docs/_static/imgs/readme_colab.png" width="150">
+    </a>
 </p>
 
 <img src="https://user-images.githubusercontent.com/3310961/194017985-ade69503-9d68-46a2-b518-2db1a012f090.gif" width="52%"/> <img src="https://user-images.githubusercontent.com/3310961/194020648-7e5f380c-15ca-461d-8c1c-20beb586defe.gif" width="46%"/>