Quiz page added in header.

[yashi-15]

Quiz page is added in navigation bar

closes#1471

Changes Done:

• Added a link to Quiz page in the navigation bar through "Play Quiz".
• Created a Quiz page which is linked to "Play Quiz".
• Removed the quiz section from home page as now it can be accessed through navigation bar.
• Added some styling for the created page.

Check list

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📷 Screenshots

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[rohanbabbar04]

I think if we have added the Play Quiz on the menu bar, there is no point of having a pop-up for the quiz. So i think we should remove that...

[yashi-15]

I have removed pop-up and some repeating code which was there. Please check and let me know if some other changes are required. Thanks

[yashi-15]

Changes done:

• Extra code is removed.

• Play and High score is not opening in new tab now.

  Please let me know if any further changes needed. Thank You! @rohanbabbar04

[rohanbabbar04]

Looks great thanks :)