Redesigned WebView2 TOC

[mikehoffms]

April 9, 2024: Closing this PR without Merging, to avoid History corruption. This PR wrongly lists "archive.md" (due to GitHub bug) as entirely changed by this PR, yet not changed; kept identical. So, created fresh PR #3124 that doesn't have archive.md listed in Files Changed.

Rendered TOC for review:
https://review.learn.microsoft.com/microsoft-edge/webview2/?branch=pr-en-us-2725
Before:
https://learn.microsoft.com/microsoft-edge/webview2/

Oct 11 note: PR 2856 creates TOC bucket, "Test and automation in WebView2 apps". Resulting TOC bucket:
https://learn.microsoft.com/microsoft-edge/webview2/how-to/set-preview-channel

• Merged "main" into present PR to integrate that change.

Objectives of this TOC redesign:

• Removes abstract TOC buckets ("Fundamentals", "Advanced") and directly/immediately shows their content.
  • Uses more topical, specific TOC buckets, and a generally flatter design that reveals more articles and specific topics by default.
  • Enables more flexible grouping/placement of the articles.
  • Eliminates a guessing/ hiding/ exploration-demanding/ discovery UX.
  • Makes maintenance/improvement easier.
• Groups together articles such as distribution.md & versioning.md that were spread apart between two different TOC buckets (Fundamentals & Deployment). Within any topical TOC bucket, articles about basics are first, and advanced/specialized articles are below them.
• Instead of mixing two different schemes for the TOC (group by topic vs. group by Fundamentals/Advanced), the new design uses only a single scheme: group by topic.

This PR also makes the following changes:

• Change article title from:
  "Understand the different WebView2 SDK versions"
  to:
  "Prerelease and Release SDKs for WebView2"
  to be more specific (than "versions") and provide the key words.
  https://review.learn.microsoft.com/en-us/microsoft-edge/webview2/concepts/versioning?branch=pr-en-us-2725
• Changed article title from "Interop of native-side and web-side code" to "Interop of native and web code".
  https://review.learn.microsoft.com/en-us/microsoft-edge/webview2/how-to/communicate-btwn-web-native?branch=pr-en-us-2725

This TOC redesign is moved out from the Diagrams PR #2450, to simplify and focus that PR, and to expedite publishing this TOC redesign.

Mapping from existing TOC (left) to redesigned TOC (right):

[mikehoffms]

Closing PR without merging.

[learn-build-service-prod]

Learn Build status updates of commit 3dee258:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/toc.yml	✅Succeeded	View
microsoft-edge/webview2/concepts/frames.md	✅Succeeded	View
microsoft-edge/webview2/concepts/overview-features-apis.md	✅Succeeded	View
microsoft-edge/webview2/concepts/versioning.md	✅Succeeded	View
microsoft-edge/webview2/how-to/communicate-btwn-web-native.md	✅Succeeded	View
microsoft-edge/webview2/how-to/set-preview-channel.md	✅Succeeded	View
microsoft-edge/webview2/release-notes.md	✅Succeeded	View
microsoft-edge/webview2/samples/webview2apissample.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit aba9676:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/toc.yml	✅Succeeded	View
microsoft-edge/webview2/concepts/frames.md	✅Succeeded	View
microsoft-edge/webview2/concepts/overview-features-apis.md	✅Succeeded	View
microsoft-edge/webview2/concepts/versioning.md	✅Succeeded	View
microsoft-edge/webview2/how-to/communicate-btwn-web-native.md	✅Succeeded	View
microsoft-edge/webview2/how-to/set-preview-channel.md	✅Succeeded	View
microsoft-edge/webview2/release-notes.md	✅Succeeded	View
microsoft-edge/webview2/samples/webview2apissample.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 49f8070:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/toc.yml	✅Succeeded	View
microsoft-edge/webview2/concepts/frames.md	✅Succeeded	View
microsoft-edge/webview2/concepts/overview-features-apis.md	✅Succeeded	View
microsoft-edge/webview2/concepts/versioning.md	✅Succeeded	View
microsoft-edge/webview2/how-to/communicate-btwn-web-native.md	✅Succeeded	View
microsoft-edge/webview2/how-to/set-preview-channel.md	✅Succeeded	View
microsoft-edge/webview2/release-notes/archive.md	✅Succeeded	View
microsoft-edge/webview2/samples/webview2apissample.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[mikehoffms]

Closing this PR without Merging, to avoid History corruption. This PR wrongly lists "archive.md" (due to GitHub bug) as entirely changed by this PR, yet not changed; kept identical. So, created fresh PR #3124 that doesn't have archive.md listed in Files Changed.