Add `sortablejs` to replace vendor version

package.json

@@ -74,6 +74,7 @@
     "sanitize-html": "^1.16.1",
     "select2": "3.5.2-browserify",
     "sha1": "^1.1.1",
+    "sortablejs": "^1.7.0",
     "sql.js": "^0.4.0",
     "stickyfilljs": "^2.0.5",
     "style-loader": "^0.21.0",

yarn.lock

@@ -7744,6 +7744,10 @@ sort-keys@^2.0.0:
   dependencies:
     is-plain-obj "^1.0.0"
 
+sortablejs@^1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/sortablejs/-/sortablejs-1.7.0.tgz#80a2b2370abd568e1cec8c271131ef30a904fa28"
+
 source-list-map@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.0.tgz#aaa47403f7b245a92fbc97ea08f250d6087ed085"