Remove unnecessary build script and dev dependencies (#1737)

Author: robinv8

packages/taro-ui-demo-rn/package.json

@@ -16,7 +16,6 @@
     "css": "sass"
   },
   "scripts": {
-    "build": "pnpm run build:rn",
     "build:weapp": "taro build --type weapp",
     "build:swan": "taro build --type swan",
     "build:alipay": "taro build --type alipay",

packages/taro-ui/package.json

@@ -54,14 +54,6 @@
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^11.0.2",
-    "@tarojs/plugin-platform-alipay": "3.6.6",
-    "@tarojs/plugin-platform-h5": "3.6.6",
-    "@tarojs/plugin-platform-jd": "3.6.6",
-    "@tarojs/plugin-platform-qq": "3.6.6",
-    "@tarojs/plugin-platform-swan": "3.6.6",
-    "@tarojs/plugin-platform-tt": "3.6.6",
-    "@tarojs/plugin-platform-weapp": "3.6.6",
-    "@tarojs/taro-rn": "3.6.6",
     "@rollup/plugin-json": "^4.0.2",
     "@rollup/plugin-node-resolve": "^7.1.1",
     "@tarojs/components": "3.6.6",