This simplifies the table and reduces its size.
Also copy assets manually since Sphinx does not automatically copy
images to _images when used for custom directives.
We have index pages for most modules now, which link to individual classes. It is helpful if these empty class headers are hyperlinks. This commit does just that.
For most sensors/devices so far this is not really necessary as the images are already hyperlinks. But this will become more useful as we start adding index pages like these for classes without images, such as parameters.
Laurens Valk