[doc] add tomogui logo to the project documentation

doc/source/conf.py

@@ -141,7 +141,7 @@ html_theme = 'default'
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-# html_logo = "img/silx.png"
+html_logo = "img/tomogui.png"
 
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32