docs: fix broken relative links on schema marketplace page

[petercrocker]

Problem

The docs build (and the downstream infrahub-docs aggregation build) fails with broken-link errors on the schema marketplace page:

- Broken link on source page path = /schema/marketplace:
   -> linking to ../create-and-load (resolved as: /create-and-load)
   -> linking to ../extensions (resolved as: /extensions)

Cause

docs/docs/schema/marketplace/index.mdx is an index.mdx, so its route is /schema/marketplace. The Related resources links used extensionless relative paths (../overview, ../create-and-load, ../extensions). Docusaurus resolves extensionless links URL-relative against the route, so a single ../ overshoots past /schema/ to the site root, producing /create-and-load and /extensions (which don't exist). ../overview happened to resolve to the unrelated /overview section page, masking a third latent mis-link.

Fix

Add the .mdx extension so the links resolve file-relative to the sibling pages in docs/docs/schema/, matching the convention already used elsewhere in this same file (e.g. the prerequisites link to ../../deploy-manage/install-configure/install/overview.mdx).

Validation

Verified the corrected paths point at existing sibling files (overview.mdx, create-and-load.mdx, extensions.mdx). The equivalent fix was confirmed to clear the broken-link build failure in the infrahub-docs aggregation repo.

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Summary by cubic

Fix broken links on the Schema Marketplace page by adding .mdx so Docusaurus resolves them file‑relative. Also adds LDAP login and auto‑create groups, moves merge to the database, and auto‑discovers migrations with a cleaner CLI.

^{Written for commit 1843a1e. Summary will update on new commits.}

Review in cubic

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Shadow auto-approve: would auto-approve. This documentation-only change fixes three broken relative links by adding .mdx extensions, which resolves a build error and has no impact on any code, business logic, or infrastructure.

Re-trigger cubic</sub>