build

Restructure IRB's documentation #4197

Job	Run time
lint	9s
Debug compatibility test	5m 49s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	50s
rake test 2.7 (latest reline)	1m 37s
vterm-yamatanooroti 2.7	47s
rake test 2.7	1m 32s
vterm-yamatanooroti 3.0 (latest reline)	31s
rake test 3.0 (latest reline)	1m 30s
vterm-yamatanooroti 3.0	36s
vterm-yamatanooroti 3.1 (latest reline)	40s
rake test 3.0	1m 25s
vterm-yamatanooroti 3.1	36s
vterm-yamatanooroti 3.2 (latest reline)	35s
rake test 3.1 (latest reline)	1m 29s
vterm-yamatanooroti 3.2	1m 25s
rake test 3.1	1m 24s
rake test 3.2 (latest reline)	1m 21s
vterm-yamatanooroti 3.3 (latest reline)	32s
rake test 3.2	1m 25s
vterm-yamatanooroti 3.3	33s
rake test 3.3 (latest reline)	1m 31s
vterm-yamatanooroti head (latest reline)	41s
rake test 3.3	1m 38s
vterm-yamatanooroti head	34s
rake test head (latest reline)	1m 46s
rake test head	1m 44s
	32m 42s

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