Upgrade to `NamedGraphs` v0.5, `Datagraphs` v0.2 #792

Job	Run time
Documentation	8m 1s
Julia 1.7 - ubuntu-latest - x64 - pull_request	8m 26s
Julia 1.7 - macOS-latest - x64 - pull_request	9m 12s
Julia 1.7 - windows-latest - x64 - pull_request	11m 14s
Julia 1 - ubuntu-latest - x64 - pull_request	4m 33s
Julia 1 - macOS-latest - x64 - pull_request	7m 0s
Julia 1 - windows-latest - x64 - pull_request	8m 9s
	56m 35s

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