fix(sitemap): update package.json to generate sitemap during prepublish

update package.json to generate sitemap during prepublish

Author: Matt Moran

package.json

@@ -18,7 +18,7 @@
     "cypress": "cypress open",
     "version": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0 && git add CHANGELOG.md",
     "st:generate": "node scripts/st-generate.js",
-    "prepublish": "stencil build --prod",
+    "prepublish": "stencil build --prod && node scripts/build-sitemap.js",
     "firebase:deploy": "node scripts/deploy.js",
     "firebase:deploy:dev": "firebase use default && firebase deploy --token \"$FIREBASE_TOKEN\"",
     "firebase:deploy:prod": "firebase use production && firebase deploy --token \"$FIREBASE_TOKEN\""