Manual release notes, or from NEWS.md?

Today the generated GitHub Release objects have a lot of text that is very focused on download URLs.

However, Releases are surfaced in the activity feed, and so I feel like this is a bit of a missed opportunity to tell users what's new and exciting in this release.

I would like if either

1. I could write custom text for the release, or
2. cargo-dist could somehow extract the relevant part from my NEWS.md

I can approximate the first by letting it create a release and then editing it myself, which isn't terrible.

By way of an example in the bit above the line is what I added and the bit below the line is what was generated.

This is how it looks in after edits, which I think shows why I care about what's at the top of the release.

(Apologies if this is already configurable and I missed it in the manual.)

Start by reading cargo-dist's release generation configuration and the existing NEWS.md convention. Trace how generated GitHub Release objects are assembled, then define how custom release text or relevant NEWS.md content would be selected; done means a release can show user-facing notes above the generated download details.

Written by the indexing model from the issue text.