Documentation: Improve structure and layout

[amotl]

What the title says.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.92%. Comparing base (862ffdb) to head (021eb96).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #146   +/-   ##
=======================================
  Coverage   78.92%   78.92%           
=======================================
  Files          56       56           
  Lines        1969     1969           
=======================================
  Hits         1554     1554           
  Misses        415      415           

Flag	Coverage Δ
influxdb	35.60% <ø> (ø)
main	62.11% <ø> (ø)
mongodb	49.26% <ø> (ø)

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