Update/header component

[AmosSaji]

Any italic text should be deleted from the final Pull Request text, including this line

Description

I have done the organization to the code to make it cleaner and more structured, used a consistent style for the links, used a better way to handle the submenus, and used a proper CSS framework to style the menu.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• Documentation (update or new)

How Has This Been Tested?

Tested using docker containers and tested in chrome.

Testing Checklist:

• Tested in latest Chrome

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have requested a review from ... on the Pull Request