fix: docs polish — external link check, OpenAPI card, navbar

[indykish]

Summary

• Fix OpenAPI spec card link to point to raw GitHub URL (was api.usezombie.com/openapi.json, not deployed)
• Add markdown-link-check to make lint for external URL validation in CI
• Rename navbar "Support" → "Talk to us", pointing to usezombie.com/contact/sales

Test plan

• make lint passes locally (mintlify validate + broken-links + markdown-link-check)

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR makes three documentation polish fixes: (1) corrects the OpenAPI spec card link in api-reference/introduction.mdx from the undeployed api.usezombie.com/openapi.json to the correct raw GitHub URL (consistent with the docs.json openapi field), (2) adds markdown-link-check to make lint for external URL validation with a .mlc-config.json config, and (3) renames the navbar "Support" link to "Talk to us" pointing to usezombie.com/contact/sales.

• OpenAPI card href now matches the raw GitHub URL already used in docs.json for the API reference tab
• markdown-link-check integrates with existing mintlify validate and mintlify broken-links steps
• Navbar rename aligns the CTA label with the destination page intent
• The two key concerns (POSIX ** glob expansion in the Makefile and the usezombie.com exclusion from link checking) were raised and acknowledged in previous review threads; the exclusion is intentional pending domain availability in CI

Confidence Score: 5/5

Safe to merge — all three fixes are correct and previously flagged concerns have been acknowledged by the developer.

All changes are straightforward and correctly implemented. The OpenAPI URL is now consistent between the card and docs.json. The link-checker config and Makefile addition are functional. The two concerns raised in previous review threads were addressed as intentional. No new blocking issues were found.

No files require special attention.

Important Files Changed

Filename	Overview
.mlc-config.json	New link-check config with intentional ignore patterns for usezombie.com domains (unreachable in CI) and standard exclusions for relative paths and mailto links
Makefile	Adds markdown-link-check step to lint target using **/*.mdx glob; glob expansion limitation in POSIX sh was flagged and acknowledged in a prior review thread
api-reference/introduction.mdx	OpenAPI spec card href corrected from undeployed api.usezombie.com URL to the raw GitHub URL, now consistent with docs.json
docs.json	Navbar 'Support' renamed to 'Talk to us' pointing to usezombie.com/contact/sales

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Make as make lint
    participant MV as mintlify validate
    participant MB as mintlify broken-links
    participant MLC as markdown-link-check

    Dev->>Make: make lint
    Make->>MV: npx mintlify validate
    MV-->>Make: pass / fail
    Make->>MB: npx mintlify broken-links
    MB-->>Make: pass / fail
    Make->>MLC: npx markdown-link-check --config .mlc-config.json **/*.mdx
    Note over MLC: Ignores usezombie.com,<br/>app.usezombie.com,<br/>discord.gg, mailto:, relative paths
    MLC-->>Make: pass / fail
    Make-->>Dev: lint result

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_{Reviews (2): Last reviewed commit: "fix: use find instead of glob for recurs..." | Re-trigger Greptile}