Backport PR #15489 on branch v3.1.1-doc (DOC: adding main nav to site) - #15509

Backport PR #15489 on branch v3.1.1-doc (DOC: adding main nav to site)#15509

tacaswell merged 1 commit into

matplotlib:v3.1.1-docmatplotlib/matplotlib:v3.1.1-docfrom

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