remove now unused old vue2 tooling

src/pretix/static/npm_dir/package.json

@@ -1,16 +0,0 @@
-{
-  "name": "pretix",
-  "version": "0.0.0",
-  "private": true,
-  "scripts": {},
-  "dependencies": {
-    "@babel/core": "^7.28.5",
-    "@babel/preset-env": "^7.29.0",
-    "@rollup/plugin-babel": "^6.1.0",
-    "@rollup/plugin-node-resolve": "^16.0.3",
-    "vue": "^2.7.16",
-    "rollup": "^2.79.1",
-    "rollup-plugin-vue": "^5.0.1",
-    "vue-template-compiler": "^2.7.16"
-  }
-}

src/pretix/static/npm_dir/rollup.config.js

@@ -1,23 +0,0 @@
-import vue from 'rollup-plugin-vue'
-import { getBabelOutputPlugin } from '@rollup/plugin-babel'
-
-export default {
-  output: {
-    format: 'iife',
-    exports: 'named',
-  },
-  plugins: [
-    getBabelOutputPlugin({
-      presets: ['@babel/preset-env'],
-      // Running babel on iife output is apparently discouraged since it can lead to global
-      // variable leaks. Since we didn't get it to work on inputs, let's take that risk.
-      // (In our tests, it did not leak anything.)
-      allowAllFormats: true
-    }),
-    vue({
-      css: true,
-      compileTemplate: true,
-      needMap: false,
-    }),
-  ],
-};