added logo in PNG format

Author: jchiquet

template-computo-julia.qmd

@@ -181,7 +181,7 @@ It is also possible to create figures from static images:
 
 :::{#fig-logo}
 
-![](https://computo.sfds.asso.fr/assets/img/logo_text_vertical.png){height=200}
+![](https://raw.githubusercontent.com/computorg/comm/main/design/logo_text_vertical.png){height=200}
 
 Computo logo (label)
 :::