content: Tidy PWA Lighthouse audit posts

[mfriesenhahn]

Author: @mfriesenhahn
Reviewer: @kaycebasques

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[mfriesenhahn]

Comments from @patrickhulce, originally on Lighthouse PR 9539:

• The /redirects-http doc seems to give the opposite advice, we want them to redirect their http traffic to https and the doc is mostly talking about avoiding redirects.
• Do we plan to move the PWA checklist over?

[kaycebasques]

No updates.

[kaycebasques]

The scope of this PR is to normalize the content. We'll do a more thorough review of the content in a subsequent PR.

[kaycebasques]

Status: Normalization is done. Michael is fixing some docs that aren't talking about what the audit is actually measuring.

[mfriesenhahn]

Both normalization and quality work complete. Ready for @kaycebasques to review.

Note: I didn't add content where it might be helpful because I didn't want to step out of scope, but there are some posts that are very slim. Most immediately, /pwa-cross-browser.

[kaycebasques]

@kaycebasques to do a tech writer review, there's an open question around heading wording. Look at redirects post and redirects HTTPS posts. These were re-written.

Michael did quality fixes too

FYI Rob checked consistency of normalization, skimmed content, mostly looking for normalization stuff

[kaycebasques]

Done! Woohoo! Off to @robdodson to publish.

[mfriesenhahn]

@kaycebasques, you introduced a title error when you committed your changes. See PR for details.

[kaycebasques]

Thanks @mfriesenhahn for fixing my goof, off to @robdodson to publish

[robdodson]

it's uuuuuup

[github-actions]

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