Remove outdated CircuitVerse Firefox extension link

[Vaishnavi-star-ai]

Fixes #505

Summary

Removed the outdated CircuitVerse Firefox Extension link from the Docs – For Educators page.

Changes Made

• Removed broken Firefox extension download link
• Added a note indicating the extension is no longer maintained
• Verified Chrome extension link remains correct

Result

• Documentation now clearly shows that the Firefox extension is unavailable
• No broken or misleading links remain for educators

Challenges

• Locating the exact line in the large 2cvforeducators.md file
• Ensuring formatting is consistent with existing Markdown
• Preserving all other content and images in the file

Updated Section

• CircuitVerse Chrome Extension: Download link
• CircuitVerse Firefox Extension: No longer available ❌

Summary by CodeRabbit

• Documentation
  • Updated the educator documentation to reflect that the CircuitVerse Firefox extension is no longer maintained and has been removed.

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[coderabbitai]

Walkthrough

The documentation file for educators has been updated in the Google Slides embedding section. The CircuitVerse Firefox Extension download link has been removed and replaced with a note indicating that the extension is no longer maintained. This change addresses an outdated reference in the documentation. The modification results in two lines added and one line removed in the file.

🚥 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Title check	✅ Passed	The title directly and clearly summarizes the main change: removing the outdated Firefox extension link from documentation.
Linked Issues check	✅ Passed	The PR successfully addresses all requirements from issue #505: removes the broken Firefox extension link and adds a note indicating it's no longer maintained.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue objective of removing the outdated Firefox extension reference; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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