chore: add yarn command to put compiled stylesheets into builds folder

node_modules/@sindresorhus/merge-streams/readme.md

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+# merge-streams
+
+> Merge multiple streams into a unified stream
+
+## Install
+
+```sh
+npm install @sindresorhus/merge-streams
+```
+
+## Usage
+
+```js
+import mergeStreams from '@sindresorhus/merge-streams';
+
+const stream = mergeStreams([streamA, streamB]);
+
+for await (const chunk of stream) {
+	console.log(chunk);
+	//=> 'A1'
+	//=> 'B1'
+	//=> 'A2'
+	//=> 'B2'
+}
+```
+
+## API
+
+### `mergeStreams(streams: stream.Readable[]): stream.Readable`
+
+Merges an array of [readable streams](https://nodejs.org/api/stream.html#readable-streams) and returns a new readable stream that emits data from the individual streams as it arrives.
+
+If you provide an empty array, it returns an already-ended stream.