feat: move NMS agent docs

[Jcahilltorre]

Proposed changes

• Moves some Agent docs formerly in the NMS section of the docs to the Agent product section of the docs.
• Various Doc refinements

Checklist

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• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5efc8c2) 66.00% compared to head (dea1b89) 66.21%.
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
+ Coverage   66.00%   66.21%   +0.21%     
==========================================
  Files         118      118              
  Lines       13468    13468              
==========================================
+ Hits         8889     8918      +29     
+ Misses       3979     3949      -30     
- Partials      600      601       +1     

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[ADubhlaoich]

LGTM!