Consider using .toml files instead of .md files

[not-my-profile]

a407f82 split features.toml into many small files ... which of course makes sense maintenance-wise. The data is now however stored in .md files with a TOML frontmatter like

+++
title = "`debug_assert_ne!`"
rfc_id = 1653
impl_pr_id = 35074
tracking_issue_id = 35073
+++

this makes the data harder to work with. If you want to use the data for any other purpose you need to write your own parser for this non-standardized format. It also makes contributing a bit harder ... because it's not immediately clear what format these files have. .toml files are well understood by Rust programmers so I think they really are the natural choice.

[jplatte]

Having frontmatter in markdown files is a common thing and there's really not that much parsing to it. The idea with this was that some features could include an extended description after this frontmatter.

However, I haven't actually gotten around to implementing this and I don't see myself doing it in the near future. I guess it would only apply to some features anyways, so if you want to send a PR switching it back to TOML (if there's ever an extended description, it could also be a multiline string in TOML), I'm okay with merging that.