Drop old content from the FastAPI guide (#6851)

docs/guides/integration/fastapi.md

@@ -27,18 +27,18 @@ follows:
 │       └── admin.py
 ```
 
-To migrate this project to uv, add a `pyproject.toml` file to the root directory of the project with
+To use uv with this project, add a `pyproject.toml` file to the root directory of the project with
 `uv init`:
 
 ```console
 $ uv init
-$ uv add fastapi --extra standard
 ```
 
-!!! tip
+Then, add a dependency on FastAPI:
 
-    If you have an existing `pyproject.toml`, `uv init` cannot be used — but you may not need to
+```console
-    make any changes to the file.
+$ uv add fastapi --extra standard
+```
 
 You should now have the following structure:
 
@@ -82,44 +82,6 @@ $ uv run fastapi dev
 alongside the `pyproject.toml`), create a virtual environment, and run the command in that
 environment.
 
-## Initializing a FastAPI project
-
-We could reach a similar result to the above by creating a project from scratch with `uv init` and
-installing FastAPI with `uv add fastapi`, as in:
-
-```console
-$ uv init app
-$ cd app
-$ uv add fastapi --extra standard
-```
-
-By default, uv uses a `src` layout for newly-created projects, so the `app` directory will be nested
-within a `src` directory. If you copied over the source code from the FastAPI tutorial, the project
-structure would look like this:
-
-```plaintext
-.
-├── pyproject.toml
-└── src
-    └── app
-        ├── __init__.py
-        ├── main.py
-        ├── dependencies.py
-        └── routers
-        │   ├── __init__.py
-        │   ├── items.py
-        │   └── users.py
-        └── internal
-            ├── __init__.py
-            └── admin.py
-```
-
-In this case, you would run the FastAPI application with:
-
-```console
-$ uv run fastapi dev src/app/main.py
-```
-
 ## Deployment
 
 To deploy the FastAPI application with Docker, you can use the following `Dockerfile`: