feat: ✨ Sessions controller

Sessions helper methods, login and signup modals, load partial views with stimulus

Situmuls usersController, Create and Destroy user sessions

app/controllers/users_controller.rb

@@ -1,10 +1,6 @@
 # frozen_string_literal: true
 
 class UsersController < ApplicationController
-  def new
-    @user = User.new
-  end
-
   def create
     @user = User.create(user_params)
     if @user.errors.any?