Feature smaller, focused gallery examples with a lower priority

[lagru]

Description:

Maybe we can move examples whose focus is on a single function to the end of the gallery. I imagine they are mostly reached from the function itself rather than browsing the gallery thumbnails.

as suggested in this comment on our SP forum.

With the same idea, we could try to select gallery examples that we want to feature more prominently because the have a broad appeal. E.g. according to https://views.scientific-python.org/scikit-image.org (not public) our regionprops example is our most visited one.