Responsive UI and known JS bug fix

[subhranshuchoudhury]

• Responsive UI using CSS Media query.
• Bootstrap for Accordion
• trim() used in script.js, we get value from button, so some browsers add spaces in button values.

[netlify[bot]]

✅ Deploy Preview for calculator-dhanushnehru ready!

Name	Link
🔨 Latest commit	d9e16c509dac3b1ef4e4582bd3ad9d3380b6d83b
🔍 Latest deploy log	https://app.netlify.com/sites/calculator-dhanushnehru/deploys/633c6ecc34539e0008acddde
😎 Deploy Preview	https://deploy-preview-18--calculator-dhanushnehru.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[DhanushNehru]

Please recheck the comments here https://github.com/DhanushNehru/calculator/issues/1

[subhranshuchoudhury]

I think there should be a label hacktoberfest-accepted