Update "Use Origin Trials in Microsoft Edge" per new OT portal

[leahmsft]

Motivation for this PR:
We're launching a new site for origin trials at https://developer.microsoft.com/microsoft-edge/origin-trials on 10/17 (tentative). The old site https://microsoftedge.github.io/MSEdgeExplainers/origin-trials/ will still remain working, to support the Ad Selection API origin trial, until the new site supports that OT.

Rendered articles for review:

• Use origin trials in Microsoft Edge
  • /origin-trials/index.md
  • https://review.learn.microsoft.com/microsoft-edge/origin-trials/?branch=pr-en-us-3288
  • Before/Live
  • Changed title from "Use Origin Trials in Microsoft Edge".
  • Integrated Getting Started content from old portal.
    • Designed heading "Registering for an origin trial" to be target of an fwlink from the new OT site UX.
    • Designed heading "Using the origin trial token at your website" to be target of an fwlink from the new OT site UX.
    • Redesigned and integrated the headings from "Getting Started > Developer guidelines" to present high-value h2 headings in "In this article" nav.
    • Noted that the Ad Selection API OT still uses the old OT site.
    • Outline of headings:

# Use origin trials in Microsoft Edge
## (intro)
#### How the origin trial token works

## Registering for an origin trial

## Using the origin trial token at your website
#### Option 1: A \<meta\> tag within the \<head\> element of a webpage
#### Option 2: An HTTP header in your HTTP server response
#### Opting out of an origin trial experiment

## Performing feature detection and providing graceful fallback

## Testing an origin trial at `localhost`

## Renewing an origin trial token

## Duration of an origin trial
#### Scheduled expiration date
#### Early end

## Providing feedback about an origin trial

## See also

• Sign up for the Ad Selection API > Provide feedback about the origin trial
  • /web-platform/ad-selection-api.md
  • https://review.learn.microsoft.com/microsoft-edge/web-platform/ad-selection-api?branch=pr-en-us-3288#provide-feedback-about-the-origin-trial
  • Planned live
  • Added "Provide feedback about the origin trial" h2 section.
  • Linked to section from OT article.
• Experimental features and origin trials for PWAs
  • /progressive-web-apps-chromium/how-to/origin-trials.md
  • https://review.learn.microsoft.com/microsoft-edge/progressive-web-apps-chromium/how-to/origin-trials?branch=pr-en-us-3288
  • Before/Live
  • Changed title from "Experimental features and origin trials", to differentiate from the broader Edge-scoped article.
• Test and automation in Microsoft Edge
  • test-and-automation.md
  • Added missing link to Edge OTs article, in OTs section.
  • Updated OTs section/intro by copy/paste from latest Edge OTs article.
• What's New in Progressive Web Apps
  • /whats-new/pwa.md
  • https://review.learn.microsoft.com/microsoft-edge/progressive-web-apps-chromium/whats-new/pwa?branch=pr-en-us-3288
  • Before/Live
  • Removed excess links to OT site where "origin trial" is mentioned.
• Develop for the web with Microsoft Edge > Test and automation
  • develop-web-microsoft-edge.md
  • https://review.learn.microsoft.com/en-us/microsoft-edge/develop-web-microsoft-edge?branch=pr-en-us-3288#test-and-automation
  • Before/Live
  • Lowercased "origin trial".
• Handle links to your Progressive Web App > Handle links from other origins by using scope extensions
  • /progressive-web-apps-chromium/how-to/handle-urls.md
  • https://review.learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/handle-urls?branch=pr-en-us-3288#handle-links-from-other-origins-with-scope-extensions
  • Before/Live
  • Rewrote section, to separate the desc from the "Notes:" OTs content; equivalent to converting an Alert (deprecated) to a specific heading.
  • Changed heading from "Handle links from other origins with scope extensions", per corp style guide.
  • Commented that the PWA OTs article lacks section about this PWA OT.
• Hub page
  • ~/index.yml
  • https://review.learn.microsoft.com/microsoft-edge/?branch=pr-en-us-3288#microsoft-edge-for-developers
  • Before/Live
  • In "Test and automation" card, put full title of articles, for clarity and consistency.
• Docset landing page
  • /developer/index.yml
  • https://review.learn.microsoft.com/microsoft-edge/developer/?branch=pr-en-us-3288
  • Before/Live
  • In "Test and automation" card, put full title of articles, for clarity and consistency.
• TOC
  • toc.yml
  • https://review.learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/whats-new/pwa?branch=pr-en-us-3288
  • Before/Live
  • Put full title of "What's New in Progressive Web Apps".
    • Limitations: When type "what's new" in "Filter by title", this article is still not listed, b/c too many DevTools articles, above it in TOC - evidence: What's New in DevTools 80 isn't listed; the final item listed is "Microsoft Edge 81".
  • Put full titles of "Handle foo" articles in TOC.
    • To clarify TOC entry for maintainers (& users).
    • For consistency.
    • Use displayName: as little as possible. When fabricate a different, shortened TOC title, that extra line is required, to make full title appear in "Filter by title" UI.
• Global in repo
  • Lowercased "origin trial".
  • Changed old OT site url to new url, except for Ad Selection API OT.

AB#54425026

[mikehoffms]

LGTM - Writer/Editor

[learn-build-service-prod]

Learn Build status updates of commit cb44872:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/develop-web-microsoft-edge.md	✅Succeeded	View
microsoft-edge/developer/index.yml	✅Succeeded	View
microsoft-edge/index.yml	✅Succeeded	View
microsoft-edge/origin-trials/index-images/reg-form.png	✅Succeeded	View
microsoft-edge/origin-trials/index-images/renew-token.png	✅Succeeded	View
microsoft-edge/origin-trials/index-images/token-displayed.png	✅Succeeded	View
microsoft-edge/origin-trials/index.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/demo-pwas.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/how-to/handle-urls.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/how-to/origin-trials.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/whats-new/pwa.md	✅Succeeded	View
microsoft-edge/test-and-automation/test-and-automation.md	✅Succeeded	View
microsoft-edge/toc.yml	✅Succeeded	View
microsoft-edge/web-platform/ad-selection-api.md	✅Succeeded	View

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[leahmsft]

lgtm-pm