docs(README): replace external asciinema embed with local SVG

[kingsword09]

Replace the external asciinema embed with a locally animated SVG, allowing users to view the demo directly in the README without needing to visit asciinema.

[Byron]

Thanks a lot!

Somehow, I currently prefer the README static instead of auto-playing, even though I totally admit that seeing something automatically on a landing page helps to sell/elevate it, provided the demo is nicely made.

I am clearly torn :D.

My concern is that this recording is 3 years old, and it might be better to update it beforehand. Would you be able to share the code (maybe even in the justfile) that allows to generate these animated SVGs?

Thanks again.

[Byron]

You know, let's just try it - the file costs 7kb when compresses, I think it's OK to experiment with that.
I'd still appreciate information on how this file can be (re)generated.

[kingsword09]

@Byron I used the svg-term-cli tool to generate the SVG file.
The exact command was:

svg-term --cast=542159 --out etc/gix-asciicast.svg --window