Use docfx from nuget

[bart-vmware]

Blockers in docfx v2.81.0:

• [Bug] Broken HTML rendering on self-closing para tag dotnet/docfx#11187

[github-actions]

External link checking results

Status	Count
🔍 Total	2102
🔗 Unique	1143
✅ Successful	1183
⏳ Timeouts	0
🔀 Redirected	149
👻 Excluded	915
❓ Unknown	0
🚫 Errors	4
⛔ Unsupported	0

Errors per input

Errors in docs/articles/releases/steeltoe-4-0-0-rc1.md

• [403] https://x.com/SteeltoeOSS (at 110:17) | Rejected status code: 403 Forbidden

Errors in docs/docs/v3/bootstrap/index.md

• [403] https://x.com/SteeltoeOSS (at 109:243) | Error (cached)

Errors in docs/docs/v3/tracing/index.md

• [403] https://www.w3.org/TR/trace-context/ (at 91:137) | Rejected status code: 403 Forbidden

Errors in docs/docs/v4/bootstrap/app-bootstrap.md

• [403] https://x.com/SteeltoeOSS (at 113:243) | Error (cached)

Full Github Actions output

[github-actions]

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