chore(redirects): add redirects missing in the old docs

[novusnota]

Closes #2086

Found a couple related links and added redirects for them too.

Summary by CodeRabbit

• Documentation

  • Added three permanent redirects so legacy documentation links automatically send users to the updated locations, preserving access to restructured content.

• Chores

  • Enhanced the link-check process to validate code snippets during broken-link checks, improving detection of invalid references.

[mintlify]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1785ecb7-7f0f-4a70-a137-4528dd63c840

📥 Commits

Reviewing files that changed from the base of the PR and between 85dd0ff and fb01f29.

📒 Files selected for processing (1)

• package.json

✅ Files skipped from review due to trivial changes (1)

• package.json

---

📝 Walkthrough

Walkthrough

Three permanent redirects were added to docs.json and the check:links npm script in package.json was updated to include --check-snippets.

Changes

Cohort / File(s)	Summary
Redirect Configuration docs.json	Added three permanent redirect entries: /learn/overviews/ton-blockchain → /start-here, /learn/overviews/cells → /foundations/serialization/cells, /learn/overviews/addresses → /foundations/addresses/overview.
Scripts package.json	Updated check:links script from mint broken-links to mint broken-links --check-snippets to enable snippet validation during link checks.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 On old paths I hopped to see,

Three signs point where links should be,
A tiny flag for checks so neat,
Snippets guarded, routes complete.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The package.json change to add --check-snippets flag is out of scope; it's unrelated to the redirect configuration requested in the linked issue.	Remove the --check-snippets modification to package.json as it's outside the scope of adding redirects for old documentation URLs.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change of adding redirect rules for old documentation URLs.
Linked Issues check	✅ Passed	The PR addresses the primary objective from issue #2086 by adding the redirect from /learn/overviews/addresses to /foundations/addresses/overview, plus two additional related redirects.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch closes-2086/old-doc-missed-a-redirect

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[github-actions]

Thanks for the updates in docs.json: there are a couple of suggestions to align the new redirects with the intended information architecture, so please apply the inline suggestions.