chore: update stylelint config (#2400)

.stylelintrc

@@ -0,0 +1,21 @@
+{
+  "extends": [
+    "@vant/stylelint-config"
+  ],
+  "rules": {
+    "unit-no-unknown": [
+      true,
+      {
+        "ignoreUnits": "/rpx/"
+      }
+    ],
+    "selector-type-no-unknown": [
+      true,
+      {
+        "ignoreTypes": [
+          "/page/"
+        ]
+      }
+    ]
+  }
+}

example/app.wxss

@@ -1,12 +1,12 @@
 page {
-  color: #333;
-  font-size: 16px;
-  background: #f2f3f5;
-  min-height: 100vh;
   box-sizing: border-box;
+  min-height: 100vh;
   padding: 0 0 100rpx;
+  color: #323233;
+  font-size: 16px;
+  font-family: 'PingFang SC', Helvetica, Arial, sans-serif;
+  background: #f7f8fa;
   -webkit-font-smoothing: antialiased;
-  font-family: 'PingFang SC', Helvetica, 'STHeiti STXihei', 'Microsoft YaHei', Tohoma, Arial, sans-serif;
 }
 
 .demo-margin-left {

package.json

@@ -81,11 +81,6 @@
     "webpack-cli": "^3.3.6",
     "webpack-serve": "^2.0.3"
   },
-  "stylelint": {
-    "extends": [
-      "@vant/stylelint-config"
-    ]
-  },
   "prettier": {
     "singleQuote": true
   },