Support multi-model pages #894

Job	Run time
build	2m 58s
Julia 1.6 - ubuntu-latest - x64	3m 18s
Julia 1.6 - macOS-latest - x64	4m 5s
Julia 1.6 - windows-latest - x64	15m 37s
Julia 1 - ubuntu-latest - x64	5m 13s
Julia 1 - macOS-latest - x64	5m 31s
Julia 1 - windows-latest - x64	5m 55s
Julia pre - ubuntu-latest - x64	4m 55s
Julia pre - macOS-latest - x64	6m 28s
Julia pre - windows-latest - x64	5m 51s
Julia nightly - ubuntu-latest - x64	5m 25s
Julia nightly - macOS-latest - x64	7m 17s
Julia nightly - windows-latest - x64	6m 31s
	1h 19m 4s

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