OCI journey - OIE upgrade: Identify Okta integrations and customizations

[brentschaus-okta]

Description:

• What's changed?
  Adds a new OIE-upgrade guide, Identify your Okta authentication integrations and customizations, which helps customers discover and inventory every Okta integration point — redirect/hosted sign-in, embedded Sign-In Widget, custom sign-in pages, Auth.js/Okta SDKs, apps, SSWS API tokens, OAuth service apps, custom authorization servers, event/inline hooks, Okta Workflows, directory agents, and log streams — before upgrading from Classic Engine to Identity Engine. It also covers validating active usage via reports and the System Log, and mapping owners + upgrade actions.

  • New guide: docs/guides/oie-upgrade-identify-integrations/ (guide + registration).
  • Registration/navigation: entry added to docs/guides/index.md and vuepress-theme-prose/const/navbar.const.js.
  • Inbound cross-links to the new guide added from sign-in-overview, the oie-intro concept, ie-limitations, and the authn API reference. No journey (oie-upgrade-*) docs were modified — those are owned separately.
  • Editorial/QA: grouped headings to shorten the "On this page" TOC; applied an Acrolinx terminology + spelling pass; reviewed all unordered lists against the InfoDev Style Guide.

  Note: navbar placement may need revisiting as the broader journey doc structure firms up. I placed it as the first sub-link under Okta Identity Engine upgrade (before "Plan embedded app upgrades"), since discovery precedes planning.

• Is this PR related to a Monolith release?
  No. Targeting the July monthly developer docs release (code freeze June 26, 2026.07.0).

Resolves

• OKTA-1177823

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[okta-prod-github-app]

Acrolinx score

A minimum Acrolinx Score of 80 is required. The total score is an average of the subscores.
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Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/concepts/oie-intro/index.md	88	100	90	69
✅ packages/@okta/vuepress-site/docs/guides/ie-limitations/main/index.md	85	94	88	63
✅ packages/@okta/vuepress-site/docs/guides/index.md	87	67	80	78
✅ packages/@okta/vuepress-site/docs/guides/oie-upgrade-identify-integrations/index.md	100	100	100	100
✅ packages/@okta/vuepress-site/docs/guides/oie-upgrade-identify-integrations/main/index.md	85	75	71	91
✅ packages/@okta/vuepress-site/docs/guides/sign-in-overview/main/index.md	92	90	90	100

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