Remove unused package.json file in examples

examples/package.json

@@ -1,21 +0,0 @@
-{
-  "private": true,
-  "name": "jupyterlab-examples",
-  "dependencies": {
-    "jupyterlab": "file:..",
-    "jupyter-js-utils": "^0.4.0",
-    "phosphor-commandpalette": "^0.2.0",
-    "phosphor-keymap": "^0.8.0",
-    "phosphor-splitpanel": "^1.0.0-rc.1",
-    "phosphor-widget": "^1.0.0-rc.1"
-  },
-  "scripts": {
-    "build": "cd .. && npm run build:examples",
-    "clean": "rimraf node_modules",
-    "postinstall": "npm dedupe",
-    "update": "rimraf node_modules/jupyterlab && npm install"
-  },
-  "devDependencies": {
-    "rimraf": "^2.5.2"
-  }
-}