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

node_modules/yaml/dist/parse/cst-stringify.d.ts

@@ -0,0 +1,8 @@
+import type { CollectionItem, Token } from './cst.js';
+/**
+ * Stringify a CST document, token, or collection item
+ *
+ * Fair warning: This applies no validation whatsoever, and
+ * simply concatenates the sources in their logical order.
+ */
+export declare const stringify: (cst: Token | CollectionItem) => string;