Added Favicon in calculator page and main page

[aaryahjolia]

Description

I added favicon which was on main repo (Cool front end templates) to this website so whenever user opens this website, the favicon remains same.

Fixes: #595

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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[github-actions[bot]]

Our team will soon review your PR. Thanks @aaryahjolia :)

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[github-actions[bot]]

Thank you @aaryahjolia for taking out your valuable time in order to contribute to our project. Looking forward for more such amazing contributions :)