refactor: sidebar

[MarioRodrigues10]

Description

The purpose of this PR is to refactor the sidebar, since it was using alpine and other outdated stuff.

Related Issues

N/A

Steps to reproduce or test

• mix phx.server
• Open at localhost:4000
• And see the sidebar in desktop and mobile views

[MarioRodrigues10]

Thanks @joaodiaslobo 🙌

I removed a lot of bloat from div classes and somehow i moved the user up in the sidebar, I'll get that fixed today