chore: migrate iframe to standalone repo

[nicomiguelino]

User description

Removes source files from edge-apps/iframe and redirects to Screenly/iframe-app. Closes #829.

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PR Type

Other, Documentation

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Description

• Migrates iframe app to standalone repository

• Removes bundled iframe app implementation

• Redirects documentation to new repository

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Diagram Walkthrough

flowchart LR
  A["Playground iframe app"] 
  B["Source files removed"]
  C["Screenly/iframe-app repository"]
  D["README links updated"]
  A -- "migrated out" --> C
  A -- "cleanup" --> B
  D -- "points users to" --> C

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File Walkthrough

	Relevant files
Miscellaneous	3 files main.js Remove iframe runtime JavaScript implementation                    +0/-23    style.css Remove iframe app styling definitions                                        +0/-21    index.html Remove iframe app HTML entrypoint                                                +0/-19
Documentation	2 files README.md Redirect iframe app listing externally                                      +1/-1      README.md Replace iframe guide with repository notice                            +2/-60
Configuration changes	3 files .ignore Remove iframe QC ignore configuration                                        +0/-1      screenly.yml Remove iframe production manifest                                                +0/-16    screenly_qc.yml Remove iframe QC manifest                                                                +0/-16

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit f5da553)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 829 - PR Code Verified Compliant requirements: Migrate edge-apps/iframe from the Playground monorepo to Screenly/iframe-app. Redirect documentation to the standalone repository. Requires further human verification: Confirm the standalone Screenly/iframe-app repository contains the migrated source and documentation.

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

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

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[github-actions]

Persistent review updated to latest commit f5da553

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