The link to the site under "What we have so far" goes to a 404. Removing the query strings or adding index.html gets you to the site.
Unfortunately Beehiv added their tracking query strings which will break the site because of the way we host it from a static content bucket.
It's enough if you just delete the beehiiv query string.
I'll try to extend the CloudFlare worker we use for the redirect of / to index.html to also handle this.