Improve production builds and deployment

Removes all custom build & deploy scripts, switching to 5apps Deploy's
new build directory config instead. Builds production to `release/` when
updating the version using `npm version`.

package.json

@@ -17,9 +17,10 @@
     "start": "KREDITS_APM_DOMAIN=open.aragonpm.eth ember serve",
     "start:local": "WEB3_PROVIDER_URL=http://localhost:7545 ember s",
     "build": "ember build",
-    "build-prod": "ember build --environment production",
-    "update-version-file": "bash scripts/update-version-file.sh",
-    "deploy": "npm run build-prod && npm run update-version-file && bash scripts/deploy.sh"
+    "build-prod": "rm -rf release/* && ember build -prod --output-path release",
+    "preversion": "npm test",
+    "version": "npm run build-prod && git add release/",
+    "deploy": "git push 5apps master"
   },
   "devDependencies": {
     "@ember/jquery": "^0.5.2",