Add the "helix" editor to the tools page

[usagi-flow]

Summary

The Helix editor, which supports Rust among others, isn't mentioned on the Tools page yet.

A link to the Helix website https://helix-editor.com with the text "Helix" should be added.

Motivation

Helix is a modal text editor which is branded as a "post-modern text editor". It's somewhat newer, but already much better than other Editors in various areas. Here's why I believe it definitely deserves its place on the "Tools" page:

Batteries included

Helix supports Rust out-of-the-box, and that includes syntax highlighting, code completion (using LSP -> rust_analyzer), refactoring, debugging, and so on. There are no plugins required (in fact Helix has no plugin system yet, though that is being discussed), and no configuration.
In fact, there's many features it supports by default (where other Editors like Vim would require plugins).

All of the existing tools (on the "Tools" page) require at least a plugin.

Written in Rust

The editor is entirely written in Rust. This may or may not seem important, but you could indirectly consider Helix as a neat little showcase for a successful Rust application.

None of the existing tools (on the "Tools" page) are written in Rust.

Active development

This is hard to quantify of course, but I think most would agree that development is very active. New features get added frequently.
The repository is on GitHub: helix-editor/helix
The GitHub insights show a nice overview of the high activity: Pulse

Free and Open Source

Helix is licensed under the MPL. There are no commercial versions.

Drawbacks

I can't see any drawbacks. The risk of Helix not being maintained anymore is virtually zero.

Rationale and alternatives

n.a.

Maintenance

I can't imagine maintenance being required. The website domain https://helix-editor.com is highly unlikely to change. If something needs to be changed about it, I'll happily file a PR.

Unresolved Questions

n.a.

Disclaimer

I started to use Helix some months ago (around May) and I've been using it on a daily basis since then. I've been using Neovim before.
I've also started developing additional features and contributing code for Helix.

[dzhibas]

I think Zed is yet another editor used by rust developers