Move build status badge in README

Move build status badge down into the "Build and Run" section to avoid
it being pulled in as part of the repository description by automation.

Bug: 350055171

README.md

@@ -1,14 +1,14 @@
 # Android NDK Samples
 
-[![build](https://github.com/android/ndk-samples/actions/workflows/build.yml/badge.svg)](https://github.com/android/ndk-samples/actions)
-
 This repository contains sample apps that use the [Android NDK].
 
 For an explanation of the layout of this repository, see
 [ARCHITECTURE.md](ARCHITECTURE.md).
 
 ## Build and run
 
+[![build](https://github.com/android/ndk-samples/actions/workflows/build.yml/badge.svg)](https://github.com/android/ndk-samples/actions)
+
 1. Clone the repository
 2. Open the whole project in Android Studio
 3. Select the sample you want to run in the top bar (you may need to sync gradle