docs(README): remove DALL-E hero image (#229)

## Summary by Sourcery

Documentation:
- Update README.md by removing the DALL-E generated image and its attribution text

Author: ruancomelli

README.md

@@ -14,16 +14,14 @@ Boiling Learning
 <h1 align="center">
 <a href="https://github.com/ruancomelli/boiling-learning">
 <img
-  src=https://user-images.githubusercontent.com/22752929/179121666-171ab746-a072-4e62-80fa-448c4bd3f646.png
-  alt="Robot underwater surrounded by bubbles"
-  width="300"
+  src=https://user-images.githubusercontent.com/22752929/181357665-f1fb9c59-ec02-46f8-b723-f38c15576bfd.gif
+  alt="Bubbles! Bubbles! Bubbles! Bubbles!"
+  width="200"
   align="center"
 >
 </a>
 </h1>
 
-_Image generated by [DALL-E mini](https://www.craiyon.com/) using the prompt "robot watching bubbles in water"_
-
 ---
 
 ## About
@@ -32,17 +30,6 @@ Project developed by [Ruan Comelli](https://github.com/ruancomelli) at [UFSC (Fe
 
 If you are curious about the evolution of this project, take a look at the [changelog](CHANGELOG.md).
 
-<h1 align="center">
-<a href="https://github.com/ruancomelli/boiling-learning">
-<img
-  src=https://user-images.githubusercontent.com/22752929/181357665-f1fb9c59-ec02-46f8-b723-f38c15576bfd.gif
-  alt="Nemo - Bubbles! Bubbles! Bubbles! Bubbles!"
-  width="200"
-  align="center"
->
-</a>
-</h1>
-
 ## Versioning
 
 This project uses [ZeroVer](https://0ver.org/), a versioning scheme in which software never leaves major version **0**. This means that breaking changes are expected frequently.