feat: add postcss-preset-env (#1022)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1022
Reviewed-by: konrad <k@knt.li>
Co-authored-by: dpschen <dpschen@noreply.kolaente.de>
Co-committed-by: dpschen <dpschen@noreply.kolaente.de>

package.json

@@ -62,7 +62,6 @@
     "@vitejs/plugin-legacy": "1.6.2",
     "@vitejs/plugin-vue": "1.9.4",
     "@vue/eslint-config-typescript": "9.1.0",
-    "autoprefixer": "10.4.0",
     "axios": "0.24.0",
     "browserslist": "4.18.1",
     "cypress": "9.0.0",
@@ -75,6 +74,7 @@
     "jest": "27.3.1",
     "netlify-cli": "6.14.25",
     "postcss": "8.3.11",
+    "postcss-preset-env": "7.0.0",
     "rollup": "2.60.0",
     "rollup-plugin-visualizer": "5.5.2",
     "sass": "1.43.4",