Downgrade Django and DRF, simplify migration commands

Django and Django REST Framework versions have been downgraded from 5.0.6 to 4 and 3.15.1 to 3.13, respectively, for compatibility issues. Also, the migration commands in the docs have been simplified, removing the specific 'music' module, to make the instructions more general and applicable for different modules.

Author: lipemorais

docs/index.md

@@ -295,8 +295,8 @@ urlpatterns = [
 Now to see it all working together we need to create the migrations for our models with the following steps.
 ```shell
 cd first_api
-./manage.py makemigrations music
-./manage.py migrate music
+./manage.py makemigrations
+./manage.py migrate
 cd ..
 task r
 ```

requirements.txt

@@ -22,11 +22,11 @@ colorama==0.4.6
     # via
     #   mkdocs-material
     #   taskipy
-django==5.0.6
+django==4
     # via
     #   building-your-first-api-with-django-and-django-rest-framework (pyproject.toml)
     #   djangorestframework
-djangorestframework==3.15.1
+djangorestframework==3.13
     # via building-your-first-api-with-django-and-django-rest-framework (pyproject.toml)
 ghp-import==2.1.0
     # via mkdocs