Fix links to FAQ about contrib.sites directory (cookiecutter#5704)

Author: iamfoysal

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/contrib/__init__.py

@@ -1,5 +1,5 @@
 """
 To understand why this file is here, please read:
 
-http://cookiecutter-django.readthedocs.io/en/latest/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
+https://cookiecutter-django.readthedocs.io/en/latest/5-help/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
 """

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/contrib/sites/__init__.py

@@ -1,5 +1,5 @@
 """
 To understand why this file is here, please read:
 
-http://cookiecutter-django.readthedocs.io/en/latest/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
+https://cookiecutter-django.readthedocs.io/en/latest/5-help/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
 """

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/contrib/sites/migrations/0003_set_site_domain_and_name.py

@@ -1,7 +1,7 @@
 """
 To understand why this file is here, please read:
 
-http://cookiecutter-django.readthedocs.io/en/latest/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
+https://cookiecutter-django.readthedocs.io/en/latest/5-help/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
 """
 from django.conf import settings
 from django.db import migrations

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/contrib/sites/migrations/__init__.py

@@ -1,5 +1,5 @@
 """
 To understand why this file is here, please read:
 
-http://cookiecutter-django.readthedocs.io/en/latest/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
+https://cookiecutter-django.readthedocs.io/en/latest/5-help/faq.html#why-is-there-a-django-contrib-sites-directory-in-cookiecutter-django
 """