CI on Linux

Move most of the README into the Guide. #567

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Run time

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Job	Run time
Compile tests	1h 45m 1s
Build / Ubuntu-24.04 / CUDA-12.8.1 / x86_64	1h 54m 8s
Build / RockyLinux-9 / CUDA-12.8.1 / x86_64	13m 49s
Build / Ubuntu-24.04 / CUDA-12.8.1 / ARM64	12m 33s
Test / Ubuntu-24.04 / CUDA-12.8.1 / ARM64	24m 29s
Test / Ubuntu-24.04 / CUDA-12.8.1 / x86_64	19m 42s
	4h 49m 42s