Include bitia image in main page

docs/source/index.md

@@ -6,7 +6,8 @@
 
 <p align="center">
 
-
+```{image} img/bitia.png 
+```
 ```{image} https://img.shields.io/pypi/v/bitia.svg
 :target: https://pypi.python.org/pypi/bitia
 ```