chore: remove ignored files from tracking

frontend/node_modules/css-tree/lib/syntax/node/CDO.js

@@ -1,19 +0,0 @@
-import { CDO } from '../../tokenizer/index.js';
-
-export const name = 'CDO';
-export const structure = [];
-
-export function parse() {
-    const start = this.tokenStart;
-
-    this.eat(CDO); // <!--
-
-    return {
-        type: 'CDO',
-        loc: this.getLocation(start, this.tokenStart)
-    };
-}
-
-export function generate() {
-    this.token(CDO, '<!--');
-}