Remove gray-matter dependency for simpler front-matter parsing (#20)

Author: quuu

package.json

@@ -57,8 +57,8 @@
   },
   "dependencies": {
     "fast-glob": "^3.3.2",
-    "gray-matter": "^4.0.3",
     "just-bash": "^2.10.2",
+    "yaml": "^2.8.3",
     "zod": "^3.23.8"
   },
   "devDependencies": {