Remove Firefox extension download link from Educators docs

[himanshujays29]

Fixes #505

Changes done:

• Removed outdated CircuitVerse Firefox Extension download reference from Educators documentation

Preview Link(s):

• https://github.com/himanshujays29/CircuitVerseDocs/blob/docs/remove-firefox-extension-reference/docs/chapter2/2cvforeducators.md

✅️ By submitting this PR, I have verified the following

• Checked to see if a similar PR has already been opened 🤔️
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Summary by CodeRabbit

• Documentation
  • Updated Google Slides embedding instructions to reflect current extension availability, removing outdated Firefox extension references and displaying only the Chrome extension option.

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[coderabbitai]

Walkthrough

The change removes an outdated download link for the CircuitVerse Firefox Extension from the documentation file docs/chapter2/2cvforeducators.md. Specifically, the modification eliminates the Firefox extension reference from the Google Slides embedding instructions section, leaving only the Chrome extension download option available in the documentation. This addresses the issue of a non-functional or unmaintained extension link in the "For Educators" chapter.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and clearly describes the main change: removing the Firefox extension download link from the Educators documentation.
Linked Issues check	✅ Passed	The PR successfully addresses issue #505 by removing the outdated Firefox extension download reference from the Educators docs as required.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to removing only the Firefox extension link from the Educators documentation, directly addressing the linked issue with no extraneous modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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