Add build script

Author: Janaka-Steph

package.json

@@ -11,7 +11,7 @@
     "last 2 versions"
   ],
   "scripts": {
-    "build": "npx gulp bundle && npx antora antora-playbook.yml"
+    "build": "gulp bundle && antora antora-playbook.yml"
   },
   "dependencies": {
     "@antora/lunr-extension": "^1.0.0-alpha.8",