Fixed navbar appearance

[Dev-sAHSRAH]

Fixes Issue

This PR fixes the following issues:
-> The navbar width is kept to 100% , so that it cover complete width on any device
-> The links have been spaced out evenly giving better appearance as compared to current navbar appearance.

Changes proposed

Here comes all the changes proposed through this PR

• Navbar width updation.
• Flexbox appearance and justification modification

Check List (Check all the boxes which are applicable)

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

Screenshots and video

Before:

After: