Move two PWA demos to Demos repo

[mikehoffms]

Related PRs:

• Move two PWA demos to Demos repo #3514 - Docs repo
• Move two PWA demos to Demos repo MicrosoftEdge/Demos#88 - Demos repo

Rendered article sections for review:

• Progressive Web App demos

  • /progressive-web-apps/demo-pwas.md
  • Internal preview: https://review.learn.microsoft.com/microsoft-edge/progressive-web-apps/demo-pwas?branch=pr-en-us-3514
  • External preview: https://github.com/MicrosoftDocs/edge-developer/blob/user/mikehoffms/move-pwa-demos/microsoft-edge/progressive-web-apps/demo-pwas.md
  • Before/live: https://learn.microsoft.com/microsoft-edge/progressive-web-apps/demo-pwas
  • Changelist:

• Synchronize and update a PWA in the background > heading

  • /progressive-web-apps/how-to/background-syncs.md
  • Internal preview: https://review.learn.microsoft.com/microsoft-edge/progressive-web-apps/how-to/background-syncs?branch=pr-en-us-3514
  • External preview: https://github.com/MicrosoftDocs/edge-developer/blob/user/mikehoffms/move-pwa-demos/microsoft-edge/progressive-web-apps/how-to/background-syncs.md
  • Before/live: https://learn.microsoft.com/microsoft-edge/progressive-web-apps/how-to/background-syncs
  • Changelist:

• Handle files in a PWA > heading

  • /progressive-web-apps/how-to/handle-files.md
  • Internal preview: https://review.learn.microsoft.com/microsoft-edge/progressive-web-apps/how-to/handle-files?branch=pr-en-us-3514
  • External preview: https://github.com/MicrosoftDocs/edge-developer/blob/user/mikehoffms/move-pwa-demos/microsoft-edge/progressive-web-apps/how-to/handle-files.md
  • Before/live: https://learn.microsoft.com/microsoft-edge/progressive-web-apps/how-to/handle-files
  • Changelist:

AB#58439066

[mikehoffms]

maybe use this PR to make minor fix clarifying Filter buttons are mockup only, per Issue:

/pwa-installer/ -- the filter buttons in upper right don't do anything
MicrosoftEdge/Demos#90

[learn-build-service-prod]

Learn Build status updates of commit 40bc86c:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/progressive-web-apps/demo-pwas.md	✅Succeeded	View
microsoft-edge/progressive-web-apps/how-to/background-syncs.md	✅Succeeded	View
microsoft-edge/progressive-web-apps/how-to/handle-files.md	✅Succeeded	View
microsoft-edge/web-platform/samples.md	✅Succeeded	View

For more details, please refer to the build report.