[py] Remove broken logo from Sphinx generated API docs (SeleniumHQ#15597)

Author: cgoldberg

py/docs/selenium_logo_small.png

@@ -117,7 +117,7 @@
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-html_logo = '../selenium_logo_small.png'
+#html_logo = ''
 
 # 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