build

[doc] remove the `module` page as it's now part of `installation` #2480

Job	Run time
host-windows-cross	39s
docs	41s
client (gcc, g++, xdg-shell, Release)	44s
host-linux	59s
client (gcc, g++, xdg-shell, Debug)	51s
host-windows-native	1m 20s
module	21s
client (gcc, g++, libdecor, Release)	43s
obs (gcc)	28s
client (gcc, g++, libdecor, Debug)	40s
obs (clang)	29s
client (clang, clang++, xdg-shell, Release)	52s
client (clang, clang++, xdg-shell, Debug)	43s
client (clang, clang++, libdecor, Release)	57s
client (clang, clang++, libdecor, Debug)	50s
	11m 17s

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