chore: optimise webpack config for examples

[webdiscus]

Hello @ankurk91,

I'm using your awesome component and have optimized the Webpack config for myself. Now I would like to share an improved configuration.

Before merging try please my forked branch:

git clone https://github.com/webdiscus/demo-vue-flatpickr-component.git
cd demo-vue-flatpickr-component
npm i
npm run build
npm start

Note: file-loader is deprecated in Webpack 5, use the type: 'asset/resource' instead of file-loader