[FRONT] create log-out option

[lulcca]

❗️ Check the label before starting task, it depends on this ❗️
Log-out is not yet implemented in the project. Once implemented, it's necessary to add the button on the sidebar and clear the localstorage token.

• (optional) (ux/ui) create button on sidebar
• (front) create button at the bottom of the sidebar with the proper backend request, also: remove token from localstorage.