Merge pull request #47 from KIT-MRT/vertically_stack_readme_images

Vertically stack images in readme. Closes #46

README.md

@@ -8,8 +8,10 @@ Arbitration graphs combine simple atomic behavior blocks to more complex behavio
 
 We are currently working on a demonstration of this library using Pac-Man as an example application.
 
-<p float="left" style="display: flex; justify-content: center; align-items: center; gap: 30px;">
-  <img src="docs/pacman_scenario.png" width="300" />
+<p align="center">
+  <img src="docs/pacman_scenario.png" width="400" />
+</p>
+<p align="center">
   <img src="docs/pacman_arbitrator_safe.svg" width="500" /> 
 </p>