fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/css-tree/lib/syntax/index.js

@@ -0,0 +1,10 @@
+import createSyntax from './create.js';
+import lexerConfig from './config/lexer.js';
+import parserConfig from './config/parser.js';
+import walkerConfig from './config/walker.js';
+
+export default createSyntax({
+    ...lexerConfig,
+    ...parserConfig,
+    ...walkerConfig
+});