package.json: properly configure xo and postcss

xo doesn't understand CSS syntax so it was useless that it was checking CSS files.

Also, configure autoprefixer so that its changes do not need a prettier fix after that.

Signed-off-by: XhmikosR <xhmikosr@gmail.com>

package.json

@@ -19,8 +19,8 @@
     "prettier:check": "prettier -l \"style/*.css\" \"style/themes/*.css\" \"scripts/**/*.js\"",
     "prettier:fix": "prettier --write \"style/*.css\" \"style/themes/*.css\" \"scripts/**/*.js\"",
     "xo": "xo",
-    "xo:check": "npm run xo -- \"style/*.css\" \"style/themes/*.css\" \"scripts/**\"",
-    "xo:fix": "npm run xo -- --fix \"style/*.css\" \"style/themes/*.css\" \"scripts/**\"",
+    "xo:check": "npm run xo",
+    "xo:fix": "npm run xo -- --fix",
     "test": "npm run prettier:check && npm run xo:check",
     "testpr": "npm run prettier:fix && git diff --ws-error-highlight=all --color=always --exit-code && npm run xo:check"
   },
@@ -91,11 +91,13 @@
         }
       ],
       "unicorn/filename-case": "off",
+      "unicorn/no-anonymous-default-export": "off",
       "unicorn/no-array-for-each": "off",
       "unicorn/no-for-loop": "off",
       "unicorn/no-document-cookie": "off",
       "unicorn/numeric-separators-style": "off",
       "unicorn/prefer-includes": "off",
+      "unicorn/prefer-module": "off",
       "unicorn/prefer-node-append": "off",
       "unicorn/prefer-number-properties": "off",
       "unicorn/prefer-query-selector": "off",

postcss.config.js

@@ -0,0 +1,11 @@
+/* eslint-env node */
+
+"use strict";
+
+module.exports = (/* ctx */) => ({
+  plugins: {
+    autoprefixer: {
+      cascade: false,
+    },
+  },
+});