[7.x][docs] Streamline Beats getting started guides#19302

Merged

dedemorton merged 3 commits intoelastic:7.xfrom dedemorton:backport_17007_7.x

Jun 24, 2020

+4,015-2,903

Commits on Jun 18, 2020

Commits on Jun 23, 2020

Fix APM overview link
dedemorton
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