The problem
You want a URL shortener for your custom domain and you want an easy way to create and update URLs but you don't want to pay hundreds of dollars a year.
This solution
This relies on Netlify's _redirects file for building a super simple URL shortener where the URLs are managed on GitHub and Netlify handles the redirecting for you.
Inspiration and all credits
See Kent C. Dodds faboulous https://github.com/kentcdodds/netlify-shortener or his [https://github.com/kentcdodds/netlify-shortener-example](example repository). This repository just reuses his idea.