What's wrong with the current theme? I quite like the simplicity. It's easy to navigate and read and it doesn't feel bloated like a lot of websites do.

The theme does what it needs to, so I'd only change it if you want to make it more fun for _you_, or make it feel more personal to you -- and in that case it's 100% personal what you go for.

I was doubting it's easy to read.

For example, take this page: https://marcolabarile.me/quickstart/oauth2-oidc-which-flow/

Wouldn't it be better without the right (personal info) and left (table of contents) columns in your opinion?