Changed styling of ExpensePage.jsx and added a toast

[HemanthTigga]

🛠️ Fixes Issue #64

Closes #<64>

👨‍💻 Description

• Changed styling of ExpensePage.jsx.
• Added a Toast whenever we add an expense.
• These changes makes the page more modern and eye catchy.

📄 Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

New Expense Page:

✅ Checklist

• I am a participant of GSSoC-ext.
• I have followed the contribution guidelines of this project.
• I have viewed deployment of my code.
• My changes generate no new warnings.
• I have added documentation to explain my changes.

🤝 GSSoC Participation

• This PR is submitted under the GSSoC program.
• I have taken prior approval for this feature/fix.

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Name	Status	Preview	Comments	Updated (UTC)
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[HemanthTigga]

please review