CarpetX: Merge documentation files into a single .tex file #994

Job	Run time
download-build-test (cpu, real32, debug)	8m 30s
download-build-test (cpu, real64, debug)	8m 53s
download-build-test (cpu, real64, optimize)	12m 56s
download-build-test (cuda, real32, debug)	19m 12s
download-build-test (cuda, real64, debug)	19m 45s
download-build-test (cuda, real64, optimize)	19m 2s
download-build-test (rocm, real64, debug)	15m 59s
download-build-test (rocm, real64, optimize)	15m 35s
	1h 59m 52s

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