Improve Aside block design

[danyx23]

We want to tweak the design of Aside blocks a bit.

The currently look like this:

Here is what we want instead:

• in general the color of text would be Blue 60 instead of Blue 90 (like the original design)
• on desktop, if possible, it would be nice if the aside filled 3 columns
• when the screen shrinks, there is a strange space between the paragraph the aside is attached to and then one below it. We’d like to avoid that (as you can see in the new design) so that the aside and the paragraph were independent
• on mobile, we’d also like to tweak the design as seen in the png

[rakyi]

We could probably use useMediaQuery hook to set the correct rendering order, if it isn't possible in pure CSS.