Correct file paths in documentation

This commit corrects the file paths provided in the documentation, changing from dot notation to the correct slash notation. It also removes an empty item in the requirements list in the documentation.

Author: lipemorais

docs/images/index.md

@@ -5,9 +5,9 @@
 The goal of this tutorial is for you to have Music API ready to receive songs, albums, and artists. While you learn [Django](https://www.djangoproject.com/) and [Django Rest Framework a.k.a DRF](https://www.django-rest-framework.org/) to build you first API
 
 Requirements list:
+
 1. Python 3
 2. Git
-3. 
 
 - **Total Duration:** 3 hours 30 minutes
 - **Lecture:** 1 hour (approximately 30%)
@@ -104,7 +104,7 @@ This will create the app structure for us. Something similar to this below:
 
 Don't forget to add the app music to your INSTALLED_APPS in your `settings.py`
 ```python
-# settings.py
+# first_api/settings.py
 ...
 INSTALLED_APPS = [
     "django.contrib.admin",
@@ -131,7 +131,7 @@ We are going to create 3 models in the file models.py
 Let's start with the artist model.
 
 ```python
-# music.models.py
+# music/models.py
 class Artist(models.Model):
     name = models.CharField(max_length=100)
 
@@ -145,7 +145,7 @@ from django.db import models
 ```
 Now the album model
 ```python
-# music.models.py
+# music/models.py
 class Album(models.Model):
     title = models.CharField(max_length=100)
     artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
@@ -158,7 +158,7 @@ class Album(models.Model):
 The last model will be the song model that will have relationship with artist and album.
 
 ```python
-# music.models.py
+# music/models.py
 class Song(models.Model):
     author = models.CharField(max_length=100)
     title = models.CharField(max_length=100)
@@ -173,7 +173,7 @@ Now let's go to the URL Mapping, we need to associate the url with the handler f
 
 
 ```python
-# first_api.urls.py
+# first_api/urls.py
 from django.contrib import admin
 from django.urls import path, include
 
@@ -186,7 +186,7 @@ urlpatterns = [
 You need to create a file `urls.py` inside music folder and make it look like the example below.
 
 ```python
-# music.urls.py
+# music/urls.py
 from django.urls import path
 
 from . import views
@@ -200,7 +200,7 @@ And last but not least you need to create this
 you need to create the view. A function view in this case.
 
 ```python
-# music.views.py
+# music/views.py
 from django.http import HttpResponse
 
 
@@ -247,7 +247,7 @@ With the serializer in place we need more 2 steps, the url mapping and the view.
 Let's do both in sequence, first the view. For the view we are going to use a [ModelViewSet](https://www.django-rest-framework.org/api-guide/viewsets/#modelviewset). Inside our file `music.views.py` we need to add this snipper.
 
 ```python
-# music.views.py
+# music/views.py
 ...
 class ArtistViewSet(viewsets.ModelViewSet):
     queryset = Artist.objects.all()
@@ -270,7 +270,7 @@ from music.serializers import ArtistSerializer
 Ok, now we just need to map our ArtistViewSet to a URL. In our `music.urls.py` we are going to use one more resource that DRF provides us, the [Default Router](https://www.django-rest-framework.org/api-guide/routers/#defaultrouter). It will create a set of common routes for our ViewSet.
 This will be the code:
 ```python
-# music.urls.py
+# music/urls.py
 from django.urls import path, include
 from rest_framework import routers