docs: fix broken relative links in Core Concepts page

[devin-ai-integration]

What

Fixes broken links on the Core Concepts documentation page reported in Slack. The links under "Sync Schedule", "Destination Namespace", and "Delivery Method" sections were returning 404 errors.

How

The Core Concepts page is rendered from a readme.md file in a directory, making it an index page. With trailingSlash: false in vercel.json, the URL becomes /platform/using-airbyte/core-concepts (no trailing slash). When browsers resolve relative links like sync-schedules from this URL, they treat core-concepts as a file rather than a directory, causing the link to resolve to /platform/using-airbyte/sync-schedules instead of /platform/using-airbyte/core-concepts/sync-schedules.

Fixed by converting relative links to absolute paths:

• sync-schedules → /platform/using-airbyte/core-concepts/sync-schedules
• namespaces → /platform/using-airbyte/core-concepts/namespaces
• ../delivery-methods → /platform/using-airbyte/delivery-methods

Applied to current docs and all versioned docs (1.6, 1.7, 1.8, 2.0).

Review guide

1. docs/platform/using-airbyte/core-concepts/readme.md - main source file
2. Versioned docs in docusaurus/platform_versioned_docs/ - identical changes

Key verification: Confirm the absolute paths resolve correctly in both current and versioned documentation contexts.

User Impact

Users will no longer encounter 404 errors when clicking the Sync Schedules, Namespaces, or Delivery Methods links on the Core Concepts page.

Can this PR be safely reverted and rolled back?

• YES 💚

---

Requested by: ian.alton@airbyte.io

Link to Devin run: https://app.devin.ai/sessions/c4eb2e4e161443a2a9a7293d74d4adb4

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