itch.io

I’m sorry to disappoint, but: ShareX to make screenshots and Visual Studio Code as text editor.

I wrote some CSS rules to do semi-automatic layout for me, and the content is written directly as HTML.
The layout is largely grid-based, but intentionally overflows containers in order to enable further relative positioning.

To my knowledge, there is no software tool that can make this sort of layout automatically for you.
I’ll ask around a bit, though. There’s a chance some visual tool exists that’s good for making this sort of thing manually.