Well, I can't say I made this website. The notes are mine, but everything concerning the deployment of my notes on the web is managed by an Obsidian plugin created by oleeskild.
So I can just thank you, oleeskild!
I won't copy/paste the documentation of this plugin here, so if you really want to know how a website like this can technically be made, check this link: https://dg-docs.ole.dev/.