Problem with showing data in View

I have follow next example https://github.com/kumarashwin/pluralsight-shawn-wildermuth-web-app

And when I create my controller(which should be same as his TripsController) to return Ok with data, browser is not parsing to HTML it is only shown json format in browser.

using System;
using System.Collections.Generic;
using AutoMapper;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using RnD.Models.Repository;
using RnD.Models.ViewModels;

namespace RnD.Controllers.Web
{

    [Route("/machines")]
    [Authorize]
    public class MachineTypeController : Controller
    {
        private ILogger<MachineTypeController> _logger;
        private IMachineTypeRepository _repository;

        public MachineTypeController(IMachineTypeRepository repository, ILogger<MachineTypeController> logger)
        {
            _logger = logger;
            _repository = repository;
        }

        [HttpGet("")]
        public IActionResult Index()
        {
            try
            {
                var results = _repository.GetAllMachineTypes();

                return Ok(Mapper.Map<IEnumerable<MachineTypeViewModel>>(results));
            }
            catch (Exception ex)
            {
                _logger.LogError($"Failed to get all Machine types: {ex}");
                return BadRequest("Error Occurred");
            }

        }
    }
}

If I put to return View it will work correctly.

Here is Startup.cs

using System.Threading.Tasks;
using AutoMapper;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Serialization;
using RnD.Models.DataFixtures;
using RnD.Models.Entity;
using RnD.Models.Repository;
using RnD.Models.ViewModels;

namespace RnD
{
    public class Startup
    {
        private IHostingEnvironment _env;
        private IConfigurationRoot _config;

        public Startup(IHostingEnvironment env)
        {
            _env = env;

            var builder = new ConfigurationBuilder()
                .SetBasePath(_env.ContentRootPath)
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();

            _config = builder.Build();
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton(_config);

            services.AddDbContext<RnDContext>();

            services.AddIdentity<ApplicationUser, IdentityRole>(config =>
            {
                config.User.RequireUniqueEmail = false;
                config.Password.RequireDigit = false;
                config.Password.RequireUppercase = false;
                config.Password.RequiredLength = 8;
                config.Cookies.ApplicationCookie.LoginPath = "/auth/login";
                config.Cookies.ApplicationCookie.Events = new CookieAuthenticationEvents()
                {
                    OnRedirectToLogin = async ctx =>
                    {
                        if (ctx.Request.Path.StartsWithSegments("/api") && ctx.Response.StatusCode == 200)
                        {
                            ctx.Response.StatusCode = 401;
                        }
                        else
                        {
                            ctx.Response.Redirect(ctx.RedirectUri);
                        }
                        await Task.Yield();

                    }
                };
            }).AddEntityFrameworkStores<RnDContext>();

            services.AddScoped<IMachineTypeRepository, MachineTypeRepository>();

            services.AddTransient<RnDContextSeedData>();

            services.AddLogging();

            services.AddMvc(config =>
            {
                if (_env.IsProduction())
                {
                    config.Filters.Add(new RequireHttpsAttribute());
                }
            })
            .AddJsonOptions(config =>
            {
                config.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app,
            IHostingEnvironment env,
            RnDContextSeedData seeder,
            ILoggerFactory loggerFactory

            )
        {

            Mapper.Initialize(config =>
            {
                config.CreateMap<MachineTypeViewModel, MachineType>().ReverseMap();
            });
            loggerFactory.AddConsole();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                loggerFactory.AddDebug(LogLevel.Information);
            }
            else
            {
                loggerFactory.AddDebug(LogLevel.Error);
            }
            app.UseStaticFiles();
            app.UseIdentity();
            app.UseMvc(config =>
            {
                config.MapRoute(
                  name: "Default",
                  template: "{controller}/{action}/{id?}",
                  defaults: new { controller = "Home", action = "Index" }
                  );
            });

            seeder.EnsureSeedData().Wait();
        }
    }
}

Here is code from angular

app.js

// app.js
(function () {
    "use strict";

    angular.module("app",[]);
})();

machineController.js

// machineController.js
(function () {
    "use strict";

    angular.module("app")
        .controller("machineController", machineController);



    function machineController($http) {
        /* jshint validthis:true */
        var vm = this;

        vm.machines = [];

        vm.errorMessage = "";

        $http.get("/machines")
            .then(function (response) {
                // Success
                angular.copy(response.data, vm.machines);
            }, function (error) {
                // Failure
                vm.errorMessage = "Failed: " + error;
            });

    }
})();

Index.cshtml

@model IEnumerable<RnD.Models.Entity.MachineType>
@{
    ViewBag.Title = "Machine Type List";
}

@section scripts{

    <script src="~/lib/angular/angular.js"></script><script src="~/js/app.js"></script><script src="~/js/machineController.js"></script>
}<div class="row" ng-app="app"><div ng-controller="machineController as vm" class="col-md-6 col-md-offset-6"><table class="table table-responsive"><tr ng-repeat="machine in vm.machines"><td>{{machine.name}}</td></tr></table></div></div>