[docs] point QEMU Linux quick start at qemu-nographic.sh

The quick start only ever mentions ./qemu.sh, and its file table omits
the qemu-nographic scripts entirely. qemu.sh passes -serial stdio
without -nographic, so QEMU opens a GTK window for the emulated CLCD.
On a headless machine or over SSH it stops at "gtk initialization
failed", with nothing in the guide explaining what to do next, even
though the BSP already ships qemu-nographic.sh for exactly this case.

Add both nographic scripts to the file table and document them where
the project is first run.

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