Remove the Blynk page

[bharvey88]

Blynk (legacy) is gone: the v1 cloud shut down on 31 December 2022 and WLED removed Blynk support from the firmware shortly after ("Removed Blynk support (servers shut down on 31st Dec 2022)" in the changelog). The page has carried a shutdown warning since, while still walking readers through a signup flow that no longer exists.

• Delete interfaces/blynk.md and its nav entry.
• Redirect the old URL to Home Automation, the closest surviving page about third-party control. Builds on Replace hand-made Moved stub pages with real redirects #352 (the redirects plugin); merge that first and this reduces to one commit.
• Drop the Blynk mentions that describe current behavior: the landing page interface list, the FAQ sync-interface advice, the Sync settings "Device Auth token" row, and a JSON API example list.

Deliberately kept: the UDP notifier call-mode table row (protocol enum values are historical API reference), the install-binary notes describing what old 0.x binaries disabled, and the Blynk library credit on Contributors.

Summary by CodeRabbit

• Documentation
  • Updated troubleshooting guidance to recommend enabling only one sync interface at a time: Hue sync or MQTT.
  • Removed outdated Blynk IoT references, setup instructions, settings, navigation entries, and API documentation references.
  • Added redirects for removed or relocated documentation pages, including the former Blynk interface page.
  • Refined settings and supported-interface documentation to reflect the currently documented configuration options.

[coderabbitai]

Walkthrough

The documentation removes Blynk references and its interface page, updates related settings and API descriptions, removes Blynk from navigation, and adds MkDocs redirects for retired documentation pages.

Changes

Documentation retirement and URL preservation

Layer / File(s)	Summary
Remove obsolete interface references docs/basics/faq.md, docs/features/settings.md, docs/index.md, docs/interfaces/blynk.md, docs/interfaces/json-api.md	Blynk is removed from interface guidance, settings, supported interfaces, JSON API descriptions, and the dedicated interface page.
Configure documentation redirects mkdocs.yml	MkDocs gains redirect mappings for retired pages, and Blynk is removed from the Interfaces navigation.
Estimated code review effort: 1 (Trivial)	~5 minutes

Possibly related PRs

• wled/WLED-Docs#352: Both changes configure MkDocs redirect mappings.

Poem

A bunny hops past Blynk’s old page,
While redirects guard each dusty stage.
Hue and MQTT now lead the way,
Clean docs bloom in bright array.
“Hop onward!” says the rabbit, “Hooray!”

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely matches the main change: removing the Blynk documentation page and related navigation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code

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[softhack007]

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