Documentation/tutorial notebooks

In the Kernel Design page, there is a missing reference to the "Manipulating Kernels" notebook at the end. This notebook seems accessible from the old documentations, up to 2.6.4.

It seems for some reason, this page was removed. Maybe it was considered unnecessary, as some information is given in the getting started page but I disagree. I believe it gives a more comprehensive review of the available kernel implementations, so it would be nice to have it back.

As a side note, for some reason 2.6.4 documentation insist on having dark theme for me, but I like the light theme better. Is there an option to change this? I am forced to clean the cookies to get a light background.