Improve Page Speed

Google has this tool called [PageSpeed](https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fcodelab.pronus.io) that provides recommendations about how to improve the page.

1. [Deploying ES2015+ Code in Production Today](https://philipwalton.com/articles/deploying-es2015-code-in-production-today/)
2. [Serve images in next-gen formats](https://web.dev/uses-webp-images/)