Update tech radar README for composability

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

.changeset/spotty-pigs-bathe.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-tech-radar': patch
+---
+
+Update README for composability

plugins/tech-radar/README.md

@@ -18,7 +18,7 @@ It serves and scales well for teams and companies of all sizes that want to have
 
 The Tech Radar can be used in two ways:
 
-- **Simple (Recommended)** - This gives you an out-of-the-box Tech Radar experience. It lives on the `/tech-radar` URL of your Backstage installation, and you can set a variety of configuration directly in your `apis.ts`.
+- **Simple (Recommended)** - This gives you an out-of-the-box Tech Radar experience. It lives on the `/tech-radar` URL of your Backstage installation.
 - **Advanced** - This gives you the React UI component directly. It enables you to insert the Radar on your own layout or page for a more customized feel.
 
 ### Install
@@ -26,6 +26,7 @@ The Tech Radar can be used in two ways:
 For either simple or advanced installations, you'll need to add the dependency using Yarn:
 
 ```sh
+cd packages/app
 yarn add @backstage/plugin-tech-radar
 ```
 
@@ -34,17 +35,16 @@ yarn add @backstage/plugin-tech-radar
 Modify your app routes to include the Router component exported from the tech radar, for example:
 
 ```tsx
-import { Router as TechRadarRouter } from '@backstage/plugin-tech-radar';
+// in packages/app/src/App.tsx
+import { TechRadarPage } from '@backstage/plugin-tech-radar';
 
-// Inside App component
-<Routes>
-  {/* other routes ... */}
-  <Route
-    path="/tech-radar"
-    element={<TechRadarRouter width={1500} height={800} />}
-  />
-  {/* other routes ... */}
-</Routes>;
+const routes = (
+  <FlatRoutes>
+    {/* ... */}
+    <Route
+      path="/tech-radar"
+      element={<TechRadarPage width={1500} height={800} />}
+    />
 ```
 
 If you'd like to configure it more, see the `TechRadarPageProps` and `TechRadarComponentProps` types for options: