Service worker no longer required, for Install UI to appear

[mikehoffms]

Rendered docset for review:

• https://review.learn.microsoft.com/microsoft-edge/developer/?branch=pr-en-us-3215 - Landing page incl. updated PWA card
  • Before/Live
• https://review.learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/service-workers?branch=pr-en-us-3215
  • Before/Live

Changes made by this PR:

• Mentioned faster & reliable eg offline as reasons to have a service worker. Removed "required for the install UI."
• Global in repo: lowercased "service worker".
• Various rewrites, mostly around service workers.
• Made article title singular: "Use a service worker..."
• Shrank service worker diagram, lowercased w.
• Updated a redirected link.
• TOC:
  • Removed PWA "Reference" toc bucket null node; thus expanded How-to.
  • Made most toc titles match top-of-article title. & hub & global landing.

AB#52267798

[captainbrosset]

I added a new commit to remove the TODOs, rephrase the parts that still needed to be rephrased, and update the how-to/index tutorial's content and screenshots.

[captainbrosset]

Approving this, but let's do what you suggested:

• Use the singular service worker where it makes sense.
• Change the TOC accordingly.
• Mention faster, reliable, and offline as benefits of the service worker.

[captainbrosset]

My last comments on this are minor improvements, so I'm approving this PR.

[learn-build-service-prod]

Learn Build status updates of commit 31f9f32:

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