Fix for "Permission denied (publickey)" error (#7333)

Using https fixes the issue with running the `git clone` command resulting in the error:
>git@github.com: Permission denied (publickey).
>fatal: Could not read from remote repository.
>
>Please make sure you have the correct access rights
>and the repository exists.

docs/introduction/01-install.rst

@@ -45,7 +45,7 @@ Open the terminal application on your computer and go to a safe folder (i.e. cd
 
 ::
 
-      git clone git@github.com:django-cms/django-cms-quickstart.git
+      git clone https://github.com/django-cms/django-cms-quickstart.git
       cd django-cms-quickstart
       docker compose build web
       docker compose up -d database_default