chore: migrate countdown-timer to standalone repo

[nicomiguelino]

User description

Removes source files from edge-apps/countdown-timer and redirects to Screenly/countdown-timer-app. Closes #824.

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PR Type

Other, Documentation

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Description

• Remove in-repo countdown timer implementation

• Delete countdown timer manifests

• Redirect documentation to standalone repository

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Diagram Walkthrough

flowchart LR
  playground["Playground monorepo"]
  countdown["Countdown timer files"]
  standalone["Screenly/countdown-timer-app"]
  docs["Repository documentation"]
  playground -- "removes" --> countdown
  countdown -- "migrates to" --> standalone
  docs -- "links users to" --> standalone

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File Walkthrough

	Relevant files
Miscellaneous	4 files main.js Remove countdown timer application script                                +0/-302  common.css Remove shared countdown timer styles                                          +0/-309  styles.css Remove countdown timer component styles                                    +0/-383  index.html Remove countdown timer HTML entrypoint                                      +0/-81
Documentation	2 files README.md Update countdown timer repository link                                      +1/-1      README.md Replace app docs with migration notice                                      +2/-61
Configuration changes	2 files screenly.yml Remove production Screenly app manifest                                    +0/-77    screenly_qc.yml Remove QC Screenly app manifest                                                    +0/-77

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit eedcd38)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 824 - PR Code Verified Compliant requirements: Remove the in-repository countdown timer app implementation from Playground. Point users to the standalone repository at Screenly/countdown-timer-app. Requires further human verification: Confirm the standalone Screenly/countdown-timer-app repository contains the migrated app files and manifests.

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

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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[github-actions]

Persistent review updated to latest commit eedcd38

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