Added Espressif logo to documentation

docs/conf_common.py

@@ -186,7 +186,7 @@ html_theme = 'default'
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+html_logo = "../_static/espressif-logo.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