Support multi-model pages in Stipple #1060

Job	Run time
build	2m 20s
Julia 1.6 - ubuntu-latest - x64	4m 10s
Julia 1.6 - macOS-latest - x64	5m 21s
Julia 1.6 - windows-latest - x64	12m 18s
Julia 1 - ubuntu-latest - x64	5m 43s
Julia 1 - macOS-latest - x64	6m 32s
Julia 1 - windows-latest - x64	7m 23s
Julia nightly - ubuntu-latest - x64	6m 7s
Julia nightly - macOS-latest - x64	9m 3s
Julia nightly - windows-latest - x64	6m 57s
	1h 5m 54s

Provide feedback