Refactor documentation structure by simplifying API section in make.jl #286

Job	Run time
Documentation	3m 14s
Julia nightly - ubuntu-latest - x64 - push	2m 0s
Julia nightly - macOS-latest - x64 - push	2m 10s
Julia nightly - windows-latest - x64 - push	2m 21s
	9m 45s

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