Cleanup some entries coming from FinnAPL (and probably others)

[Bubbler-4]

Reposting my chat message here to not get forgotten:

Regarding the graph-related FinnAPL entries (the ones without TIO links), I have a feeling that it's OK to deprecate them in favor of more standard graph structures in CS, e.g. adjacency matrix, adjacency list, or incidence matrix.
There are multiple reasons:

1. they use the terms "connectivity matrix", "connectivity list", "connection list", "node matrix" without explaining how those structures represent a graph (by maintaining those entries, we have extra burden of explaining those structures for minimal amount of usefulness)
2. the idiom list doesn't present ways to do some interesting computation on them, e.g. degrees or distances, other than converting between each other.

Maybe we can find similar issues on some other entries; I think we can collect them and decide policies on a GitHub issue before actually working on cleaning them up.