Update article "Analyze CSS selector performance"

[mikehoffms]

Rendered articles for review:

• Analyze CSS selector performance during Recalculate Style events
  • https://review.learn.microsoft.com/microsoft-edge/devtools-guide-chromium/evaluate-performance/selector-stats?branch=pr-en-us-3141
  • Before/Live
  • Changed "selector" to "CSS selector".
    • Added "CSS" in title.
  • Flattened headings outline to leverage "In this article" nav.
  • Made each procedure start with true Step 1 instead of skipping over the initial or prerequisite steps.
  • Updated text & screenshots per latest forthcoming UI.
• Overview of DevTools
  • https://review.learn.microsoft.com/microsoft-edge/devtools-guide-chromium/overview?branch=pr-en-us-3141
  • Before/Live
  • Updated screenshots re: More tools UI.

AB#50480246

[captainbrosset]

I know this isn't yet ready to review, but wanted to leave this quick comment.

[learn-build-service-prod]

Learn Build status updates of commit 0462772:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/devtools-guide-chromium/css/css-overview-tool.md	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/evaluate-performance/selector-stats.md	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/evaluate-performance/selector-stats-images/copy-table.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/evaluate-performance/selector-stats-images/enable-feature.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/evaluate-performance/selector-stats-images/full-recording.png	✅Succeeded	View
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