docs(examples): add NeMoGuard safety rails config example for Colang 1.0

[Pouyanpi]

Description

Add example configuration and documentation for using NVIDIA NeMoGuard NIMs, including content moderation, topic control, and jailbreak detection.

nemoguardrails chat --config="./examples/configs/nemoguards"

or

from nemoguardrails import LLMRails, RailsConfig
config = RailsConfig.from_path("./examples/configs/nemoguards")
rails = LLMRails(config=config)

rails.generate(messages=[{"role": "user", "content":"what can you do?"}])

[github-actions]

Documentation preview

https://nvidia.github.io/NeMo-Guardrails/review/pr-1365

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.62%. Comparing base (960e0b8) to head (8591870).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1365   +/-   ##
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  Coverage    71.62%   71.62%           
========================================
  Files          171      171           
  Lines        17020    17020           
========================================
  Hits         12191    12191           
  Misses        4829     4829           

Flag	Coverage Δ
python	71.62% <ø> (ø)

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