Move package.json to angular directory for v3.

Per conversation with Adam, we are trying to get GitHub to properly pick up the Used By
count for Ionic 3 which is much higher than v4 today. This is a dummy package.

.scripts/v3/package.json

@@ -1,16 +0,0 @@
-{
-  "name": "ionic-angular",
-  "version": "`gulp package` generates dist/package.json from this template using the root ./package.json",
-  "description": "",
-  "keywords": [],
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/ionic-team/ionic-v3.git"
-  },
-  "license": "MIT",
-  "main": "umd/index.js",
-  "module": "index.js",
-  "es2015": "es2015/index.js",
-  "peerDependencies": {
-  }
-}