chore: remove nav proptype (#670)

[damirgros]

Fixes Issue

My PR closes #670

👨‍💻 Changes proposed(What did you do ?)

Removed propTypes from NavBar.jsx.

The following two pieces of code have been removed:

import PropTypes from 'prop-types';

and

NavBar.propTypes = { 
 	className: PropTypes.string, 
 }; 

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.

Note to reviewers

Removed import for proptypes.

📷 Screenshots

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[Dun-sin]

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