fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/css-tree/lib/syntax/node/ClassSelector.js

@@ -0,0 +1,24 @@
+import { Delim, Ident } from '../../tokenizer/index.js';
+
+const FULLSTOP = 0x002E; // U+002E FULL STOP (.)
+
+// '.' ident
+export const name = 'ClassSelector';
+export const structure = {
+    name: String
+};
+
+export function parse() {
+    this.eatDelim(FULLSTOP);
+
+    return {
+        type: 'ClassSelector',
+        loc: this.getLocation(this.tokenStart - 1, this.tokenEnd),
+        name: this.consume(Ident)
+    };
+}
+
+export function generate(node) {
+    this.token(Delim, '.');
+    this.token(Ident, node.name);
+}