CarpetX: Merge documentation files into a single .tex file #1013

Job	Run time
download-build-test (cpu, real32, debug)	8m 15s
download-build-test (cpu, real64, debug)	8m 27s
download-build-test (cpu, real64, optimize)	13m 2s
download-build-test (cuda, real32, debug)	18m 59s
download-build-test (cuda, real64, debug)	19m 19s
download-build-test (cuda, real64, optimize)	18m 45s
download-build-test (rocm, real64, debug)	15m 11s
download-build-test (rocm, real64, optimize)	15m 46s
	1h 57m 44s

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