Support multi-model pages #886

Job	Run time
build	3m 3s
Julia 1.6 - ubuntu-latest - x64	3m 31s
Julia 1.6 - macOS-latest - x64	3m 35s
Julia 1.6 - windows-latest - x64	10m 26s
Julia 1 - ubuntu-latest - x64	4m 54s
Julia 1 - macOS-latest - x64	7m 30s
Julia 1 - windows-latest - x64	6m 18s
Julia pre - ubuntu-latest - x64	5m 6s
Julia pre - macOS-latest - x64	5m 40s
Julia pre - windows-latest - x64	5m 40s
Julia nightly - ubuntu-latest - x64	5m 18s
Julia nightly - macOS-latest - x64	5m 24s
Julia nightly - windows-latest - x64	6m 4s
	1h 12m 29s

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