Lemmy community sidebars need more "related communities" links

Most communities are not the sole community related to their topic, there are really often other communities on the same, or similar topics.

An example: there are a tonne of art related comunities, but only a small handful of them have links to other related communities.

It would be great if there was more of a culture of propping up semi-related communities. This would be particularly useful for helping more niche communities get rolling.