Add improved docs

Author: wooorm

readme.md

@@ -8,20 +8,56 @@
 [![Backers][backers-badge]][collective]
 [![Chat][chat-badge]][chat]
 
-[**hast**][hast] utility to check if a `node` is [*inter-element
-whitespace*][spec].
+[hast][] utility to check if a node is [*inter-element whitespace*][spec].
 
-## Install
+## Contents
+
+*   [What is this?](#what-is-this)
+*   [When should I use this?](#when-should-i-use-this)
+*   [Install](#install)
+*   [Use](#use)
+*   [API](#api)
+    *   [`whitespace(node|value)`](#whitespacenodevalue)
+*   [Types](#types)
+*   [Compatibility](#compatibility)
+*   [Security](#security)
+*   [Related](#related)
+*   [Contribute](#contribute)
+*   [License](#license)
+
+## What is this?
 
-This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c):
-Node 12+ is needed to use it and it must be `import`ed instead of `require`d.
+This package is a small utility that checks if a node is whitespace according to
+HTML.
 
-[npm][]:
+## When should I use this?
+
+This utility is super niche, if you’re here you probably know what you’re
+looking for!
+
+## Install
+
+This package is [ESM only][esm].
+In Node.js (version 12.20+, 14.14+, 16.0+, or 18.0+), install with [npm][]:
 
 ```sh
 npm install hast-util-whitespace
 ```
 
+In Deno with [`esm.sh`][esmsh]:
+
+```js
+import {whitespace} from 'https://esm.sh/hast-util-whitespace@2'
+```
+
+In browsers with [`esm.sh`][esmsh]:
+
+```html
+<script type="module">
+  import {whitespace} from 'https://esm.sh/hast-util-whitespace@2?bundle'
+</script>
+```
+
 ## Use
 
 ```js
@@ -46,7 +82,7 @@ whitespace({
 
 ## API
 
-This package exports the following identifiers: `whitespace`.
+This package exports the identifier `whitespace`.
 There is no default export.
 
 ### `whitespace(node|value)`
@@ -60,11 +96,23 @@ Check if the given value is [*inter-element whitespace*][spec].
 
 ###### Returns
 
-`boolean` — Whether the `value` is inter-element white-space: consisting of zero
+Whether the `value` is inter-element whitespace (`boolean`): consisting of zero
 or more of space, tab (`\t`), line feed (`\n`), carriage return (`\r`), or form
 feed (`\f`).
 If `node` is passed it must be a [*text*][text] node.
 
+## Types
+
+This package is fully typed with [TypeScript][].
+It exports no additional types.
+
+## Compatibility
+
+Projects maintained by the unified collective are compatible with all maintained
+versions of Node.js.
+As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+.
+Our projects sometimes work with older versions, but this is not guaranteed.
+
 ## Security
 
 `hast-util-whitespace` does not change the syntax tree so there are no openings
@@ -92,21 +140,21 @@ for [cross-site scripting (XSS)][xss] attacks.
     — check if a node is interactive
 *   [`hast-util-script-supporting`](https://github.com/syntax-tree/hast-util-script-supporting)
     — check if a node is a script-supporting element
-*   [`hast-util-is-body-ok-link`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-body-ok-link)
+*   [`hast-util-is-body-ok-link`](https://github.com/rehypejs/rehype-minify/tree/main/packages/hast-util-is-body-ok-link)
     — check if a node is “Body OK” link element
 *   [`hast-util-is-conditional-comment`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-conditional-comment)
     — check if a node is a conditional comment
-*   [`hast-util-is-css-link`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-css-link)
+*   [`hast-util-is-css-link`](https://github.com/rehypejs/rehype-minify/tree/main/packages/hast-util-is-css-link)
     — check if a node is a CSS link element
-*   [`hast-util-is-css-style`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-css-style)
+*   [`hast-util-is-css-style`](https://github.com/rehypejs/rehype-minify/tree/main/packages/hast-util-is-css-style)
     — check if a node is a CSS style element
-*   [`hast-util-is-javascript`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-javascript)
+*   [`hast-util-is-javascript`](https://github.com/rehypejs/rehype-minify/tree/main/packages/hast-util-is-javascript)
     — check if a node is a JavaScript script element
 
 ## Contribute
 
-See [`contributing.md` in `syntax-tree/.github`][contributing] for ways to get
-started.
+See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
+ways to get started.
 See [`support.md`][support] for ways to get help.
 
 This project has a [code of conduct][coc].
@@ -147,15 +195,23 @@ abide by its terms.
 
 [npm]: https://docs.npmjs.com/cli/install
 
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
+[esmsh]: https://esm.sh
+
+[typescript]: https://www.typescriptlang.org
+
 [license]: license
 
 [author]: https://wooorm.com
 
-[contributing]: https://github.com/syntax-tree/.github/blob/HEAD/contributing.md
+[health]: https://github.com/syntax-tree/.github
+
+[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
 
-[support]: https://github.com/syntax-tree/.github/blob/HEAD/support.md
+[support]: https://github.com/syntax-tree/.github/blob/main/support.md
 
-[coc]: https://github.com/syntax-tree/.github/blob/HEAD/code-of-conduct.md
+[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
 
 [hast]: https://github.com/syntax-tree/hast