Match httpx documentation style (#2742)

docs/applications.md

@@ -3,6 +3,8 @@ Starlette includes an application class `Starlette` that nicely ties together al
 its other functionality.
 
 ```python
+from contextlib import asynccontextmanager
+
 from starlette.applications import Starlette
 from starlette.responses import PlainTextResponse
 from starlette.routing import Route, Mount, WebSocketRoute
@@ -25,8 +27,11 @@ async def websocket_endpoint(websocket):
     await websocket.send_text('Hello, websocket!')
     await websocket.close()
 
-def startup():
-    print('Ready to go')
+@asyncontextmanager
+async def lifespan(app):
+    print('Startup')
+    yield
+    print('Shutdown')
 
 
 routes = [
@@ -37,7 +42,7 @@ routes = [
     Mount('/static', StaticFiles(directory="static")),
 ]
 
-app = Starlette(debug=True, routes=routes, on_startup=[startup])
+app = Starlette(debug=True, routes=routes, lifespan=lifespan)
 ```
 
 ### Instantiating the application

docs/index.md

@@ -1,7 +1,3 @@
----
-hide: navigation
----
-
 <p align="center">
   <img width="400px" src="/img/starlette.svg#only-light" alt="starlette"/>
   <img width="400px" src="/img/starlette_dark.svg#only-dark" alt="starlette"/>
@@ -52,18 +48,18 @@ It is production-ready, and gives you the following:
 ## Installation
 
 ```shell
-$ pip install starlette
+pip install starlette
 ```
 
 You'll also want to install an ASGI server, such as [uvicorn](https://www.uvicorn.org/), [daphne](https://github.com/django/daphne/), or [hypercorn](https://hypercorn.readthedocs.io/en/latest/).
 
 ```shell
-$ pip install uvicorn
+pip install uvicorn
 ```
 
 ## Example
 
-```python title="example.py"
+```python title="main.py"
 from starlette.applications import Starlette
 from starlette.responses import JSONResponse
 from starlette.routing import Route
@@ -81,11 +77,9 @@ app = Starlette(debug=True, routes=[
 Then run the application...
 
 ```shell
-$ uvicorn example:app
+uvicorn main:app
 ```
 
-For a more complete example, [see here](https://github.com/encode/starlette-example).
-
 ## Dependencies
 
 Starlette only requires `anyio`, and the following dependencies are optional:
@@ -103,7 +97,7 @@ You can install all of these with `pip install starlette[full]`.
 Starlette is designed to be used either as a complete framework, or as
 an ASGI toolkit. You can use any of its components independently.
 
-```python
+```python title="main.py"
 from starlette.responses import PlainTextResponse
 
 
@@ -113,10 +107,10 @@ async def app(scope, receive, send):
     await response(scope, receive, send)
 ```
 
-Run the `app` application in `example.py`:
+Run the `app` application in `main.py`:
 
 ```shell
-$ uvicorn example:app
+$ uvicorn main:app
 INFO: Started server process [11509]
 INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
 ```

docs/release-notes.md

@@ -1,5 +1,4 @@
 ---
-hide: navigation
 toc_depth: 2
 ---
 

mkdocs.yml

@@ -21,15 +21,14 @@ theme:
     repo: fontawesome/brands/github
   features:
     - content.code.copy
-    - navigation.tabs
     - toc.follow
 
 repo_name: encode/starlette
 repo_url: https://github.com/encode/starlette
 edit_uri: edit/master/docs/
 
 nav:
-  - Home: "index.md"
+  - Introduction: "index.md"
   - Features:
       - Applications: "applications.md"
       - Requests: "requests.md"