Add Stack Pack guidance to Lighthouse docs

[kaycebasques]

Continuation of #4093

fixes #3674

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[github-actions]

Alex Recommends Report

Alex recommends the following language changes, but Alex is a regular expression based algorithm, so take them with a grain of salt.

src/site/content/en/lighthouse-performance/user-timings/index.md

Level	Location	Word	Recommendation
⚠️	43:6	just	just may be insensitive, try not to use it

src/site/content/en/lighthouse-performance/uses-rel-preconnect/index.md

Level	Location	Word	Recommendation
⚠️	41:47	simple	simple may be insensitive, try not to use it

src/site/content/en/lighthouse-performance/uses-responsive-images/index.md

Level	Location	Word	Recommendation
⚠️	34:27	just	just may be insensitive, try not to use it

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[google-cla]

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We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[google-cla]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

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[kaycebasques]

@paulirish do we need to manually update the Lighthouse UI to link to these sections?

[paulirish]

@paulirish do we need to manually update the Lighthouse UI to link to these sections?

nope. the generic LH link will continue pointing to the page itself.
(And this text that's now integrated here is already in the Lightouse report UI)

[paulirish]

your copyedits look good. 👍

once this lands i'll port your edits back to the stackpack repo so they end up in the lighthouse report.

[kaycebasques]

@paulirish FYI I just merged.

I didn't know this text was in Lighthouse UI. I worry we'll get out-of-sync but we can cross that bridge when we get there.