[Edit] Add output media files for CSS `animation-play-state`

[PragatiVerma18]

Description

Add output gifs for examples used in the entry.

Issue Solved

Closes Issue #4868

Type of Change

• [ ] Adding a new entry
• [x] Editing an existing entry (fixing a typo, bug, issues, etc)
• [ ] Updating the documentation

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x] I have linked any issues that are relevant to this PR in the Issues Solved section.