Adapted layout of the gifs to fit to web presentation

cooperative_cuisine/reinforcement_learning/README.md

@@ -139,8 +139,8 @@ Preparing onion soup in the overcooked-ai large environment with a random counte
 
 
 <p align="center">
-  <img src="./data/tomato_soup_fixed_small_env_row1.gif" width="49%"  />
-  <img src="./data/tomato_soup_fixed_small_env_row2.gif" width="49%" />
+  <img src="./data/tomato_soup_fixed_small_env_row1.gif" width="60%"  />
+  <img src="./data/tomato_soup_fixed_small_env_row2.gif" width="60%" />
    Preparing a tomato soup in the cooperative cuisine environment with a fixed counter layout
 </p>