remove explicit jQuery dependency

(cherry picked from commit 858312a5cb)

# Conflicts:
#	core/admin/package.json

core/admin/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "mailu",
+  "version": "1.0.0",
+  "description": "Mailu admin assets",
+  "main": "assest/index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@babel/core": "^7.4.4",
+    "@babel/preset-env": "^7.4.4",
+    "admin-lte": "^2.4.10",
+    "babel-loader": "^8.0.5",
+    "bootstrap": "^3.4.1",
+    "css-loader": "^2.1.1",
+    "expose-loader": "^0.7.5",
+    "file-loader": "^3.0.1",
+    "font-awesome": "^4.7.0",
+    "font-awesome-loader": "^1.0.2",
+    "less": "^3.9.0",
+    "less-loader": "^5.0.0",
+    "mini-css-extract-plugin": "^0.6.0",
+    "node-sass": "^4.12.0",
+    "popper.js": "^1.15.0",
+    "sass-loader": "^7.1.0",
+    "select2": "^4.0.7-rc.0",
+    "style-loader": "^0.23.1",
+    "url-loader": "^1.1.2",
+    "webpack": "^4.30.0",
+    "webpack-cli": "^3.3.2"
+  }
+}