Merge pull request pallets#943 from skeuomorf/favicon

Added a favicon for the docs

Author: Daniel Neuhäuser

docs/_static/flask-favicon.ico

@@ -125,7 +125,7 @@
 # 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
 # pixels large.
-#html_favicon = None
+html_favicon = "flask-favicon.ico"
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,