feat: update env

[arunavabasucom]

this PR aims to add .env so that it takes the backend endpoint from the .env instead of config.js .

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
radis-app-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 24, 2023 2:05pm

[codecov-commenter]

Codecov Report

Attention: 118 lines in your changes are missing coverage. Please review.

Comparison is base (bec2d8a) 77.22% compared to head (c02f2c6) 77.26%.

Files	Patch %	Lines
frontend/src/components/Form.tsx	0.00%	118 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #702      +/-   ##
==========================================
+ Coverage   77.22%   77.26%   +0.03%     
==========================================
  Files          38       38              
  Lines        2143     2142       -1     
  Branches      100      100              
==========================================
  Hits         1655     1655              
+ Misses        488      487       -1     

Flag	Coverage Δ
backend	85.44% <ø> (ø)
frontend	76.61% <0.00%> (+0.03%)	⬆️

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