Understanding text2image?

I’m currently looking for an image generation for private use.

While searching, I find apps that are deprecated and direct to other apps.

At the end I find GitHub · Where software is built
But as far this tool is NVIDIA only (As far I understand it)
My MiniPC I use for selfhosting has an AMD CPU / GPU / NPU

So as far this is a dead end?

Any other Ideas, how I get a self-hosted Image Generation working.