Use vue-cli in demo

Author: ktquez

.gitignore

@@ -1,5 +1,4 @@
 node_modules
-demo
 dist
 .temp
 docs-old

demo/.browserslistrc

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+> 1%
+last 2 versions
+not dead

demo/.gitignore

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+.DS_Store
+node_modules
+/dist
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

demo/README.md

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+# demo
+
+## Project setup
+```
+npm install
+```
+
+### Compiles and hot-reloads for development
+```
+npm run serve
+```
+
+### Compiles and minifies for production
+```
+npm run build
+```
+
+### Customize configuration
+See [Configuration Reference](https://cli.vuejs.org/config/).

demo/babel.config.js

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+module.exports = {
+  presets: [
+    '@vue/cli-plugin-babel/preset'
+  ]
+}