Fixed and swapped the theme icons

[mehershiri]

Related Issue

Fixed the theme icons. Now the light mode icon is displayed in dark mode and dark mode icon in light mode.

Fixes #217

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots

Checklist:

• I have made this change from my own.
• I have mentioned the issue number in my Pull Request.
• I have gone through the CONTRIBUTING.md file before contributing
• I have performed a self-review of my own code.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers and screenshots after making the changes.

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[github-actions]

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[mehershiri]

@souvikpramanikgit please review the PR

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #223 has been merged! 🎉🎉