update readme: try to fix the gif

As mentioned in https://gist.github.com/DavidWells/7d2e0e1bc78f4ac59a123ddf8b74932d, it is currently not possible to align gif next to text in GitHub markdown due to the new "animation" container.

Author: hbaniecki

README.md

@@ -1,4 +1,8 @@
-# Interactive Studio for Explanatory Model Analysis <img style="display: inline-block;" src="man/figures/logo.gif" align="right" width="143px"/>
+# Interactive Studio for Explanatory Model Analysis 
+
+<p align="center">
+<img src="man/figures/logo.gif" width="150px"/>
+</p>
 
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