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

node_modules/slash/index.d.ts

@@ -0,0 +1,23 @@
+/**
+Convert Windows backslash paths to slash paths: `foo\\bar` ➔ `foo/bar`.
+
+[Forward-slash paths can be used in Windows](http://superuser.com/a/176395/6877) as long as they're not extended-length paths.
+
+@param path - A Windows backslash path.
+@returns A path with forward slashes.
+
+@example
+```
+import path from 'node:path';
+import slash from 'slash';
+
+const string = path.join('foo', 'bar');
+// Unix    => foo/bar
+// Windows => foo\\bar
+
+slash(string);
+// Unix    => foo/bar
+// Windows => foo/bar
+```
+*/
+export default function slash(path: string): string;