docs: add Device Builder Tour page to Starter Kit wiki

[bharvey88]

What does this implement/fix?

Adds a beginner-friendly walkthrough of the new ESPHome Device Builder GUI under Learn the Basics on the Starter Kit wiki. Covers the dashboard, the device info panel, the editor's three-pane layout, publishing changes (Validate / Save / Install), and logs, using the ESPHome Starter Kit as the running example throughout.

Screenshots and GIFs will follow in a separate commit/PR; the page has HTML-commented TODOs marking every placeholder.

Types of changes

• Typo / wording fix
• Content update (correcting outdated info, adding missing steps, clarifications)
• New page or new product section
• Page move / rename (redirect added in mkdocs.yml)
• Image / screenshot update
• Nav / structure change
• Site config or theme change
• CI / workflows / dependencies — Does not publish

Checklist:

• This PR targets the dev branch (not main)
• Changes previewed locally with mkdocs serve
• If pages were moved or renamed, redirects were added to mkdocs.yml
• If new pages were added, nav was updated in mkdocs.yml

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 891b3d59-d5d1-45b9-a351-ae2901495823

📥 Commits

Reviewing files that changed from the base of the PR and between b701e37 and 2c41038.

📒 Files selected for processing (2)

• docs/products/ESPHome-Starter-Kit/learning-the-basics/device-builder-tour.md
• mkdocs.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/device-builder-tour

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[bharvey88]

Superseded by a new PR built on top of latest dev.