Make website spa

[didierganthier]

Make website spa (single page application)

In this pull request, the following was completed:

• Design Navbar using nav and li
• Use index.js to add interactions to the DOM
• Make design match template

[t-yanick]

Hi Team,

Great job !!!

To Highlight! 👏 🟢

✔️ Good commit messages
✔️ Clean/Organized code,
✔️ Descriptive Readme file

Your project is complete! There is nothing else to say other than... it's time to merge it
Congratulations! 🎉

Optional suggestions

Every comment with the [OPTIONAL] prefix is not crucial enough to stop the approval of this PR. However, I strongly recommend you to take them into account as they can make your code better.

N/A

Cheers and Happy coding!👏👏👏

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