feat: 添加elementplus图标库 移除多余依赖

package.json

@@ -4,7 +4,7 @@
     "build": "vue-cli-service build"
   },
   "dependencies": {
-    "clipboard-event": "^1.6.0",
+    "@element-plus/icons-vue": "^2.0.9",
     "element-plus": "^2.2.17",
     "less": "^4.1.3",
     "vue": "^3.2.37",
@@ -12,7 +12,6 @@
   },
   "devDependencies": {
     "@vue/cli-service": "^5.0.8",
-    "copy-webpack-plugin": "^6.0.2",
     "less-loader": "^11.0.0",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "vue-template-compiler": "^2.7.8"