added responsiveness

[Durga-prasad-1]

🛠️ Fixes Issue

Closes #90

👨‍💻 Description

responsiveness of footer and newsletter page had been done. Also in homepage the newletter container made to responsive.

📄 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)

Include screenshots or GIFs to demonstrate your changes

✅ 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.

this pr is also submitted under hactoberfest.

[netlify]

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🔨 Latest commit	2c64bba

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Name	Status	Preview	Comments	Updated (UTC)
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[Durga-prasad-1]

@divyansh-2005 Please check my PR and merge it