content: Add "elevator shaft" to demo city. #508

Job	Run time
deny	41s
incremental-mutants	0s
build (ubuntu, stable, locked, true)	12m 36s
miri	1m 35s
build (windows, stable, locked, false)	31m 51s
no_std	27s
build (macos, stable, locked, false)	18m 31s
build (ubuntu, nightly, locked, false)	5m 17s
build (ubuntu, beta, locked, false)	5m 5s
build (ubuntu, stable, latest, false)	14m 29s
build (ubuntu, stable, minimal, false)	12m 41s
fuzz	15m 38s
features	26m 33s
deploy	6s
	2h 25m 30s

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