docs: update Python tutorial (#2452)

Update Python tutorial to accommodate change where `init` already adds
the python project.
See #2451

docs/tutorials/python.md

@@ -18,13 +18,22 @@ In this tutorial, we will use the `pyproject.toml` format because it is the most
 
 ## Let's get started
 
-Let's start out by making a directory and creating a new `pyproject.toml` file.
+Let's start out by creating a new project that uses a `pyproject.toml` file.
 
 ```shell
 pixi init pixi-py --format pyproject
 ```
 
-This gives you the following pyproject.toml:
+This creates a project with the following structure:
+
+```shell
+├── src
+│   └── pixi_py
+│       └── __init__.py
+└── pyproject.toml
+```
+
+The `pyproject.toml` for the project looks like this:
 
 ```toml
 [project]
@@ -49,32 +58,8 @@ pixi-py = { path = ".", editable = true }
 [tool.pixi.tasks]
 ```
 
-Let's add the Python project to the tree:
-
-=== "Linux & macOS"
-    ```shell
-    cd pixi-py # move into the project directory
-    mkdir pixi_py
-    touch pixi_py/__init__.py
-    ```
-
-=== "Windows"
-    ```shell
-    cd pixi-py
-    mkdir pixi_py
-    type nul > pixi_py\__init__.py
-    ```
-
-We now have the following directory structure:
-
-```shell
-.
-├── pixi_py
-│   └── __init__.py
-└── pyproject.toml
-```
+This project uses a src-layout, but pixi supports both [flat- and src-layouts](https://packaging.python.org/en/latest/discussions/src-layout-vs-flat-layout/#src-layout-vs-flat-layout).
 
-We've used a flat-layout here but pixi supports both [flat- and src-layouts](https://packaging.python.org/en/latest/discussions/src-layout-vs-flat-layout/#src-layout-vs-flat-layout).
 
 ### What's in the `pyproject.toml`?