docs: update archlinux build instructions

[jfrader]

Updated docs to use what worked for me on Archlinux because the current docs didn't work when I tried. Current version also makes it harder using pip to install poetry when it's already available from extra on python-poetry package so I changed that and I'm also adding other dependencies that were needed to build and run.

[cdecker]

Thanks @jfrader, notice that we have switched away from poetry in favor of uv which presents a much simpler venv-management experience. We can remove the poetry references everywhere.