CarpetX: Merge documentation files into a single .tex file #1011

Job	Run time
download-build-test (cpu, real32, debug)	8m 34s
download-build-test (cpu, real64, debug)	8m 47s
download-build-test (cpu, real64, optimize)	12m 35s
download-build-test (cuda, real32, debug)	19m 22s
download-build-test (cuda, real64, debug)	19m 57s
download-build-test (cuda, real64, optimize)	18m 30s
download-build-test (rocm, real64, debug)	15m 37s
download-build-test (rocm, real64, optimize)	15m 54s
	1h 59m 16s

Provide feedback