DOC: add some nice pictures

README.md

@@ -11,11 +11,8 @@ Applications can be used to build OTB pipelines from Python or C++ APIs.
 
 *Examples*
 <figure>
-<div style="text-align:center">
     <img src ="doc/pix2pix.png" />
-<legend align="center">Legend</legend>
-    <figcaption align="center">Transform a Spot-7 image into a Wikimedia Map (pix2pix)</figcaption>
-</div>
+    <legend align="center">Transform a Spot-7 image into a Wikimedia Map (pix2pix)</legend>
 </figure>
 
 # How to install