Rewrite System Documentation

[michaelmckinsey1]

Description

• Rewrite system documentation, specific to spack1.0 changes
• Fix benchpark system external for spack1.0
• Improve instructions on package finding process -> moved docs from own page to appendix in new system docs.
• Should address Update docs for Spack 1.0 #1049

Adding/modifying a system (docs: Adding a System)

• Update systems/aws-tutorial

Adding/modifying core functionality, CI, or documentation:

• move content from update-a-system-config.rst to appendix in add-a-system-config.rst

[scheibelp]

This looks generally good - thanks! I have a couple questions and a couple suggestions (but nothing that should block this).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 65.43%. Comparing base (9ec3377) to head (cc4f8fd).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
lib/benchpark/cmd/system.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1062      +/-   ##
===========================================
- Coverage    65.49%   65.43%   -0.07%     
===========================================
  Files           44       44              
  Lines         3237     3240       +3     
  Branches       256      256              
===========================================
  Hits          2120     2120              
- Misses        1110     1113       +3     
  Partials         7        7              

Files with missing lines	Coverage Δ
lib/benchpark/cmd/system.py	53.84% <0.00%> (ø)

... and 2 files with indirect coverage changes

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