chore: migrate simple-timer to standalone repo

[nicomiguelino]

User description

Removes source files from edge-apps/simple-timer and redirects to Screenly/simple-timer-app. Closes #839.

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PR Type

Documentation, Other

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Description

• Redirects Simple Timer documentation

• Updates root app listing URL

• Removes bundled Simple Timer entrypoint

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Diagram Walkthrough

flowchart LR
  A["Playground simple-timer app"] -- "moved to" --> B["Screenly/simple-timer-app"]
  C["Root README"] -- "links to" --> B
  D["Simple Timer README"] -- "redirects to" --> B

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File Walkthrough

	Relevant files
Miscellaneous	1 files index.html Remove Simple Timer HTML entrypoint                                            +0/-37
Documentation	2 files README.md Redirect Simple Timer listing link                                              +1/-1      README.md Replace docs with repository redirect                                        +2/-50
Additional files	10 files 1080x1920.webp [link]    1280x720.webp [link]    1920x1080.webp [link]    2160x3840.webp [link]    2160x4096.webp [link]    3840x2160.webp [link]    4096x2160.webp [link]    480x800.webp [link]    720x1280.webp [link]    800x480.webp [link]

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 2b0ece0)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 839 - PR Code Verified Compliant requirements: Point users to the standalone repository at Screenly/simple-timer-app. Requires further human verification: Confirm the standalone Screenly/simple-timer-app repository contains the migrated app source and deployment documentation.

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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Persistent review updated to latest commit 2b0ece0

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