Modify electron builder configuration to remove source code and tests

electron-builder.json

@@ -3,6 +3,22 @@
   "directories": {
     "output": "app-builds"
   },
+    "files": [
+        "**/*",
+        "!*.ts",
+        "!*.code-workspace",
+        "!LICENSE.md",
+        "!package.json",
+        "!package-lock.json",
+        "!src/",
+        "!e2e/",
+        "!hooks/",
+        "!.angular-cli.json",
+        "!_config.yml",
+        "!karma.conf.js",
+        "!tsconfig.json",
+        "!tslint.json"
+    ],
   "win": {
     "icon": "dist",
     "target": [