start using ember-cli-netlify

Author: mansona

public/_redirects renamed to .netlifyredirects

@@ -40,6 +40,7 @@
     "ember-cli-fastboot": "^3.3.2",
     "ember-cli-htmlbars": "^5.7.2",
     "ember-cli-inject-live-reload": "^2.1.0",
+    "ember-cli-netlify": "^0.4.1",
     "ember-cli-sri": "^2.1.1",
     "ember-cli-terser": "^4.0.2",
     "ember-data": "~3.28.6",