Import project configuration: vault/postcss.config.mjs

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

vault/postcss.config.mjs

@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;