Use demo for tests. Fix docs #193

Job	Run time
Documentation	1m 58s
Tests - Julia 1.6 - ubuntu-latest - x64	1m 31s
Tests - Julia 1 - ubuntu-latest - x64	1m 58s
Loading only - Julia 1.6 - ubuntu-latest - x86	1m 57s
Tests - Julia nightly - ubuntu-latest - x64	2m 2s
Loading only - Julia 1.6 - macOS-latest - x64	2m 8s
Loading only - Julia 1.6 - windows-latest - x64	11m 52s
Loading only - Julia 1.6 - windows-latest - x86	11m 46s
Loading only - Julia 1 - ubuntu-latest - x86	2m 27s
Loading only - Julia 1 - macOS-latest - x64	3m 52s
Loading only - Julia 1 - windows-latest - x64	5m 34s
Loading only - Julia 1 - windows-latest - x86	5m 44s
Loading only - Julia nightly - ubuntu-latest - x86	2m 18s
Loading only - Julia nightly - macOS-latest - x64	2m 28s
Loading only - Julia nightly - windows-latest - x64	5m 2s
Loading only - Julia nightly - windows-latest - x86	6m 2s
	1h 8m 39s

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