Edited the 'join-us form' with css. Issue-#684

[rarevyom09]

Related Issue

684-I want to edit existing style of 'join-us-form'.

Proposed Changes

• Made it theme friendly
• Gave modern as well as subtle look
• Added extra text-area space
• Made title highlighted

Additional Info

• Any additional information or context

Checklist

• [x] ✅ My code follows the code style of this project.
• [ ] 📝 My change requires a change to the documentation.
• [ ] 🎀 I have updated the documentation accordingly.
• [ ] 🌟 ed the repo

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Output Screenshots

Screenshot #1	Screenshot #2
AFTER	BEFORE

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