refactor: 更新 libman 脚本

#Comment
SignalR 升级到 3.1.0

src/admin/Bootstrap.Admin/libman.json

@@ -2,17 +2,6 @@
   "version": "1.0",
   "defaultProvider": "cdnjs",
   "libraries": [
-    {
-      "provider": "unpkg",
-      "library": "@aspnet/signalr@1.0.4",
-      "destination": "wwwroot/lib/signalr/",
-      "files": [
-        "dist/browser/signalr.js",
-        "dist/browser/signalr.js.map",
-        "dist/browser/signalr.min.js",
-        "dist/browser/signalr.min.js.map"
-      ]
-    },
     {
       "provider": "cdnjs",
       "library": "jquery@3.3.1",
@@ -121,16 +110,6 @@
         "js/bootstrap-datetimepicker.min.js"
       ]
     },
-    {
-      "provider": "unpkg",
-      "library": "dcjqaccordion@2.7.1",
-      "destination": "wwwroot/lib/dcjqaccordion/",
-      "files": [
-        "js/jquery.dcjqaccordion.2.7.js",
-        "js/jquery.dcjqaccordion.2.7.min.js",
-        "js/jquery.cookie.js"
-      ]
-    },
     {
       "provider": "cdnjs",
       "library": "bootstrap-fileinput@4.5.1",