Add SSO doc to public, reformat for ADOC

[tiffany-kobiton]

Summary

Add SSO enforcement guide to Organization > SSO Authentication
Convert to ADOC from MD
No screenshots have been added yet, will add in in next pass. Will add linking and navbar visibility in next pass.

Related PRs, issues, or features (optional)

• N/A

Metadata

• [✅ ] Adds new file(s)
• [ ✅ ] Edits existing file(s)
• Removes file(s)

PR contributor checklist

• [✅ ] My PR follows the Kobiton Docs contributor guidelines, meaning:

  • My content contains correct spelling and grammar.
  • My directories and files are named and structured correctly.
  • My style and voice follows the Microsoft Style Guide.
  • I added all new pages to their section's nav.adoc file.
  • I removed all localizations (like en-us) from my URLs.