Block favicon.ico or make it inline html

To prevent favicon.ico requests and errors when not needed or reduce the number of server requests it is possible to inline an empty .png

Based on comments here: https://stackoverflow.com/questions/1321878/how-to-prevent-favicon-ico-requests this creates an empty icon with correct mime typing.

<link rel="icon" href="data:image/png;base64,iVBORw0KGgo=">