Fix: replace broken Placekitten placeholder images with Loremflickr

[aaron-mota]

Description

Placekitten (cat placeholder images) seems to be down.

Changes Made

I've replaced the placekitten urls with loremflickr urls, another free placeholder image service that can supply cat images. It's already being used elsewhere within the codebase for cat images, and allows width and height parameters to be passed (so that the image dimensions of the original placeholders could be matched). This change could be used just temporarily if placekitten being down is also temporary.

Code of Conduct

This pull request adheres to the project's Code of Conduct.

Screenshots

(React docs) Example: Scrolling to an element

• Before change (placekitten):

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• After change (loremflickr):

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(React docs) Challenge: Scrolling an image carousel

• Before change (placekitten):

  • 

• After change (loremflickr):

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Name	Status	Preview	Comments	Updated (UTC)
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react-dev	✅ Ready (Inspect)	Visit Preview		Jun 2, 2024 1:59am

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[github-actions]

Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[aaron-mota]

Signed the CLA. Waiting for that to take effect and will rerun the GAs

UPDATE: not sure when it's going to take effect... ("up to 1 hour" was 24 hours ago)

[rickhanlonii]

Fixed by #7189