Adds NUC7 hardware recommendation and relegates NUC5s and Mac minis to legacy

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Fixes #3826.
Adds recommendation for NUC7i5BNH servers including information on securing hardware, removes Gigabyte Brix, moves NUC5s and Mac Mini to a previously recommended section for legacy support reasons.

Testing

Docs-only, review for clarity and correctness.

Deployment

Docs will be deployed by standard process when merged.

Checklist

If you made changes to documentation:

• Doc linting (make docs-lint) passed locally

[eloquence]

Overall looks great, a few small comments inline. Note that I only have the Mac Mini 2014 at hand, so can't verify any of the newly added technical details.

[codecov-io]

Codecov Report

Merging #4431 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4431   +/-   ##
========================================
  Coverage    83.72%   83.72%           
========================================
  Files           44       44           
  Lines         2956     2956           
  Branches       321      321           
========================================
  Hits          2475     2475           
  Misses         404      404           
  Partials        77       77

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[conorsch]

Built docs locally and reviewed the latest changes. Looks great!