Add remark-steps to list of plugins

[lituidev]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

ADD

[ChristianMurphy]

Welcome @lituidev! 👋
Thanks for sharing!
A few thoughts:

1. This plugin appears to be a specific kind of directive, it would be good to note both in the description here and in the package itself that directives are required (source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/src/index.ts#L23)
2. There is a types only package for MDAST nodes https://www.npmjs.com/package/@types/mdast (avoid hard coding your own node type, source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/src/index.ts#L12-L19)
3. HAST and MDAST are not the same, avoid pushing HAST nodes as children of MDAST, instead use data.hChildren https://github.com/syntax-tree/mdast-util-to-hast#fields-on-nodes (source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/src/index.ts#L32-L42)
4. You probably want to target node16 module resolution for ESM https://www.typescriptlang.org/docs/handbook/modules/reference.html#node16-nodenext (source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/tsconfig.json#L4-L6)
5. You probably want to publish somewhat readable source, let downstream adopters decide how they want to transpile, polyfill, or minify code (source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/rollup.config.mjs#L17)
6. Avoid using any in TypeScript and especially in the public interface, it largely defeats the purpose of having type checking in the first place (source: https://github.com/lit-ui/remark-steps/blob/ad235a49c593a5b57e3308552844c89f1d3b2d6e/src/index.ts#L21)
7. There are no tests currently, it can help ensure the library is working and make it easier for others to contribute by including tests. https://nodejs.org/api/test.html is very light weight and fast. https://vitest.dev/ is more feature rich similar to Jest, but with ESM support.

There are some good examples at https://unifiedjs.com/learn/ of how to traverse ASTs, narrow types, and construct ASTs in a type safe way.