chore: rename hugo folder to site, fix product naming

[Jcahilltorre]

Proposed changes

• Rename the Hugo documentation to site, which is site-builder agnostic
• Correct some instances where the docs refer to the product with the determiner in front ( The NGINX agent)

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

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (b887f38) 66.13% compared to head (b8285c4) 66.14%.
Report is 8 commits behind head on main.

Files	Patch %	Lines
...c/extensions/nginx-app-protect/nap/nap_metadata.go	46.15%	6 Missing and 1 partial ⚠️
src/core/os.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #527   +/-   ##
=======================================
  Coverage   66.13%   66.14%           
=======================================
  Files         118      118           
  Lines       13462    13468    +6     
=======================================
+ Hits         8903     8908    +5     
- Misses       3959     3960    +1     
  Partials      600      600           

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