feat: ✨ Sessions controller

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

Situmuls usersController, Create and Destroy user sessions

config/routes.rb

@@ -1,10 +1,13 @@
 # frozen_string_literal: true
 
 Rails.application.routes.draw do
-  root 'links#index'
+  root 'sessions#welcome'
 
   get '/:slug', to: 'links#redirect', as: :short
 
+  post 'login', to: 'sessions#create', as: :login
+  post 'logout', to: 'sessions#destroy', as: :logout
+
   resources :links, only: %i[create]
-  resources :users, only: %i[new create]
+  resources :users, only: %i[create]
 end