fix(package): Add copy index.html to 404.html for "gh:deploy" script

package.json

@@ -65,7 +65,7 @@
     "start": "npm-run-all ssr:start",
     "gh:build-mockapi": "node ./node_modules/@angular/cli/bin/ng build --app=demo --preserve-symlinks --base-href https://rucken.github.io/core/ --prod --env=mockapi --build-optimizer --no-sourcemap",
     "gh:build": "npm-run-all clear prepare format libs:build libs:link gh:build-mockapi",
-    "gh:deploy": "gh-pages -d apps/demo/dist",
+    "gh:deploy": "cp-cli ./apps/demo/dist/browser/index.html ./apps/demo/dist/browser/404.html",
     "ssr:build-server-mockapi": "node ./node_modules/@angular/cli/bin/ng build --app=demo-server --preserve-symlinks --prod --env=mockapi --output-hashing=false",
     "ssr:build-mockapi": "npm run ssr:client-and-server-bundles-mockapi && npm run ssr:webpack-server",
     "ssr:client-and-server-bundles-mockapi": "npm run app:build-mono_mockapi && npm run ssr:build-server-mockapi",
@@ -122,6 +122,7 @@
     "conventional-changelog-cli": "^1.3.5",
     "conventional-commits-detector": "^0.1.1",
     "conventional-recommended-bump": "^1.1.0",
+    "cp-cli": "^1.1.0",
     "es6-promise-loader": "^1.0.2",
     "gh-pages": "^1.1.0",
     "html-loader": "0.5.5",
@@ -146,4 +147,4 @@
     "typescript-formatter": "^7.0.1",
     "typings": "^2.1.1"
   }
-}
+}