CarpetX: Merge documentation files into a single .tex file #995

Job	Run time
download-build-test (cpu, real32, debug)	8m 30s
download-build-test (cpu, real64, debug)	8m 37s
download-build-test (cpu, real64, optimize)	12m 47s
download-build-test (cuda, real32, debug)	19m 33s
download-build-test (cuda, real64, debug)	19m 40s
download-build-test (cuda, real64, optimize)	18m 11s
download-build-test (rocm, real64, debug)	15m 30s
download-build-test (rocm, real64, optimize)	15m 56s
	1h 58m 44s

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