Define routes for user, category, and entity resources

•	Added the devise_for :users route to handle user authentication routes provided by Devise.
•	Added a get route for the /splash URL, directing it to the splashes#index action.
•	Defined routes within the devise_scope block to handle root URLs for authenticated and unauthenticated users.
•	For authenticated users, set the root URL to categories#index action and name it authenticated_root.
•	For unauthenticated users, set the root URL to splashes#index action and name it unauthenticated_root.
•	Created nested routes for user resources, allowing routes for categories and entities that are associated with a user.
•	Restricted the routes for users to only the index, show, and new actions.
•	Restricted the routes for categories to only the new, create, show, index, and destroy actions.
•	Restricted the routes for entities to only the new, create, index, show, and destroy actions.

app/controllers/users_controller.rb

@@ -1,69 +1,21 @@
-class UsersController < ApplicationController
-  before_action :set_user, only: %i[show edit update destroy]
+Rails.application.routes.draw do
+  devise_for :users
 
-  # GET /users or /users.json
-  def index
-    @users = User.all
-  end
-
-  # GET /users/1 or /users/1.json
-  def show; end
-
-  # GET /users/new
-  def new
-    @user = User.new
-  end
+  get '/splash', to: 'splashes#index'
 
-  # GET /users/1/edit
-  def edit; end
 
-  # POST /users or /users.json
-  def create
-    @user = User.new(user_params)
-
-    respond_to do |format|
-      if @user.save
-        format.html { redirect_to user_url(@user), notice: 'User was successfully created.' }
-        format.json { render :show, status: :created, location: @user }
-      else
-        format.html { render :new, status: :unprocessable_entity }
-        format.json { render json: @user.errors, status: :unprocessable_entity }
-      end
+  devise_scope :user do
+    authenticated :user do
+      root 'categories#index', as: :authenticated_root
     end
-  end
 
-  # PATCH/PUT /users/1 or /users/1.json
-  def update
-    respond_to do |format|
-      if @user.update(user_params)
-        format.html { redirect_to user_url(@user), notice: 'User was successfully updated.' }
-        format.json { render :show, status: :ok, location: @user }
-      else
-        format.html { render :edit, status: :unprocessable_entity }
-        format.json { render json: @user.errors, status: :unprocessable_entity }
-      end
+    unauthenticated do
+      root "splashes#index", as: :unauthenticated_root
     end
   end
 
-  # DELETE /users/1 or /users/1.json
-  def destroy
-    @user.destroy
-
-    respond_to do |format|
-      format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
-      format.json { head :no_content }
-    end
-  end
-
-  private
-
-  # Use callbacks to share common setup or constraints between actions.
-  def set_user
-    @user = User.find(params[:id])
-  end
-
-  # Only allow a list of trusted parameters through.
-  def user_params
-    params.require(:user).permit(:name)
+  resources :users, only: [:index, :show, :new] do
+    resources :categories, only: [:new, :create, :show, :index, :destroy]
+    resources :entities, only: [:new, :create, :index, :show, :destroy]
   end
 end