Shared kratos pages can only belong to one sidebar — OEL readers lose navigation context #2674

Problem

Our docs run as a single Docusaurus instance with multiple sidebars (Ory Network, OEL, OSS, CIAM, B2B, …) that all reference the same shared pages under kratos/.... Docusaurus associates every doc with exactly one sidebar. That causes two problems:

1. Dual-listing breaks navigation. If a page is listed in two sidebars, one of them wins the association and is displayed no matter where the reader came from. Example: the Device authentication section (docs: add device authentication with PIN and biometrics guide #2673) was initially listed in both the Network and OEL sidebars; the OEL sidebar won, so clicking the entry from the Ory Network tree reshuffled the entire navigation into "Ory Enterprise License". This is not specific to that section — any dual-listed page behaves this way today.
2. Single-listing orphans the other deployment. The current convention (kratos feature pages are listed in the Network sidebar only — passkeys, one-time codes, organizations, now device authentication) avoids the reshuffle, but it means OEL readers have no OEL-context navigation for feature documentation at all: search results and deep links land them in the Network tree, surrounded by Network-specific navigation (Console, migration guides) that doesn't apply to self-hosted deployments.

Proposed fix

This is exactly what the migrated deployment structure in AGENTS.md solves: shared content lives in src/components/Shared/..., each deployment gets thin shell pages under docs/network/... / docs/oel/... with its own sidebar entry, and canonical URLs handle SEO. The kratos feature sections just haven't been migrated yet.

Suggestion: migrate the kratos authentication-method docs (passwordless + MFA, or the device authentication section as a pilot) to the deployment structure, so Network and OEL readers each keep a stable sidebar.

Notes

• Behavior predates docs: add device authentication with PIN and biometrics guide #2673 — the old device binding page was dual-listed and showed the OEL sidebar even when reached from the Network tree.
• Interim mitigation applied in docs: add device authentication with PIN and biometrics guide #2673: the device authentication section is Network-only, matching the sibling convention.
• Related: Kratos docs self-hosted missing mail courier docs #2323 (self-hosted section missing specific pages) — same underlying tension: the OEL sidebar has no systematic way to carry the shared feature docs.

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