docs: documentation site content

[lipikaramaswamy]

Summary

Complete documentation site for NeMo Anonymizer, built with MkDocs Material.

Content

• Home page: Landing with tabbed strategy examples, install, quickstart code
• Concepts: Models, Detect, Replace, Rewrite -- config tables, examples, admonitions
• Tutorials: 5 notebooks with executed outputs (biographies + legal datasets)
• API Reference: Auto-generated from docstrings, empty pages excluded

Code changes

• Reorder Substitute first in replace_strategies.py (API ref priority)
• Remove {text} from Redact/Hash allowed template fields (fixes fix: remove {text} from allowed template placeholders in Redact and Hash #80)
• Reduce max_parallel_requests to 2 for rate limit safety
• Add make convert-notebooks target
• Move e2e script to tests_e2e/
• Polished Tier 1 docstrings (result types, replace methods, logging)

Styling

• NVIDIA green headers, incognito logo/favicon, card grid styling
• Sidebar nav (no top tabs), collapsed sections, DD-consistent layout
• Light mode code block backgrounds

Known follow-ups

• Colab notebook support (blocked on public repo, feat: support URL data loading for Colab notebooks #83)

Related Issues

Closes #80

[nina-xu]

awesome stuff. thanks!

saw that anonymizer replaced SpaceX with Blue Origin. Savage

[github-actions]

All contributors have signed the DCO ✍️ ✅
_{Posted by the DCO Assistant Lite bot.}

[nina-xu]

approving the notebooks 👍 i didn't read the rest

[alexahaushalter]

I have read the DCO document and I hereby sign the DCO.

[memadi-nv]

Thanks Lipika! Left some feedbacks mainly on the notebooks.
Not for this PR necessarily, but we can add something like the NSS style_guide in the future so all the docs follow the same pattern across the libraries.

[memadi-nv]

looking great, thanks Lipika!