Support multi-model pages in Stipple #1058

Job	Run time
build	2m 18s
Julia 1.6 - ubuntu-latest - x64	4m 6s
Julia 1.6 - macOS-latest - x64	4m 28s
Julia 1.6 - windows-latest - x64	14m 11s
Julia 1 - ubuntu-latest - x64	5m 41s
Julia 1 - macOS-latest - x64	6m 21s
Julia 1 - windows-latest - x64	6m 42s
Julia nightly - ubuntu-latest - x64	6m 14s
Julia nightly - macOS-latest - x64	7m 29s
Julia nightly - windows-latest - x64	7m 12s
	1h 4m 42s

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