chore: replace imports in docs and readme

Author: runemalm

README.md

@@ -46,7 +46,7 @@ $ pip install py-dependency-injection
 Here's a quick example to get you started:
 
 ```python
-from dependency_injection.container import DependencyContainer
+from dependency_injection import DependencyContainer
 
 # Define an abstract payment gateway interface
 class PaymentGateway:

docs/examples.rst

@@ -6,7 +6,7 @@ In this example, we demonstrate how to create and retrieve dependency containers
 
 .. code-block:: python
 
-    from dependency_injection.container import DependencyContainer
+    from dependency_injection import DependencyContainer
 
     # Get the default dependency container
     dependency_container = DependencyContainer.get_instance()

docs/userguide.rst

@@ -79,7 +79,7 @@ Basic workflow:
 
 .. code-block:: python
 
-    from dependency_injection.container import DependencyContainer
+    from dependency_injection import DependencyContainer
 
     class Connection:
         pass