Update "Overview of Microsoft Edge extensions"

[mikehoffms]

Rendered article sections for review:

• Overview of Microsoft Edge extensions
  • /extensions/index.md
  • Internal preview: https://review.learn.microsoft.com/microsoft-edge/extensions/?branch=pr-en-us-3768
  • External preview: https://github.com/MicrosoftDocs/edge-developer/blob/user/mikehoffms/featured/microsoft-edge/extensions/index.md
  • Before/live: https://learn.microsoft.com/microsoft-edge/extensions/
  • In Introduction section, changed the example extension from the defunct Microsoft Editor extension to the Microsoft Bing Homepage and Search Engine extension.
  • In Featured badge section, changed the example extension from the defunct Microsoft Editor extension to the Microsoft Bing Homepage extension.
  • Clarified headings.
  • Updated link text per destination title.
  • In h2 See also section, organized, made complete, added subheadings.

AB#60823027

[mikehoffms]

LGTM - Writer/Editor

[captainbrosset]

LGTM

[learn-build-service-prod]

Learn Build status updates of commit cbaf3d5:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/extensions/index-images/example-extension-screenshot.png	✅Succeeded	n/a (file deleted or renamed)
microsoft-edge/extensions/index-images/example-extension.png	✅Succeeded	View
microsoft-edge/extensions/index-images/featured-badge-on-page.png	✅Succeeded	View
microsoft-edge/extensions/index.md	✅Succeeded	View

For more details, please refer to the build report.