Add js build size optimisations

.drone.yml

@@ -6,7 +6,7 @@ steps:
   - name: build
     image: node:lts
     environment:
-      NODE_ENV: PRODUCTION
+      NODE_ENV: production
     commands:
       - npm install
       - npm run build

vue.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  productionSourceMap: false,
+  configureWebpack: {
+    optimization: {
+      splitChunks: {
+        minSize: 10000,
+        maxSize: 250000
+      }
+    }
+  }
+}