Upgrade Phoenix LiveView 0.18

This PR upgrades the Phoenix LiveView version to 0.18. Phoenix Live Dashboard also gets updated because of this.

Code changes include:

Removing references to Phoenix.LiveView.Helpers and replacing with Phoenix.Component
Removing CuberacerLiveWeb.LiveHelpers, modal/1 is moved to a new module CuberacerLiveWeb.Components
CuberacerLiveWeb.SharedComponents are moved to CuberacerLiveWeb.Components as a preliminary organizational fix
Uses of the <%= link ... function are changed to the <.link ... function component
live_redirect and live_patch also are now link function components

gcpreston / cuberacer_live