Reorganise the sdk installation sidebar

Summary:
Give the sdk installation pages a bit more structure.
To me it's much clearer now what they are.

Happy to hear differing opinions so we get it right :)

Reviewed By: passy

Differential Revision: D25638164

fbshipit-source-id: 86b7fecd8aba0068336b15a308f4a9433817c68e

docs/getting-started/android-native.mdx

@@ -1,7 +1,7 @@
 ---
 id: android-native
 title: Adding Flipper to Android apps with Gradle
-sidebar_label: Adding Flipper to Android apps with Gradle
+sidebar_label: Android with Gradle
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';

docs/getting-started/ios-native.mdx

@@ -1,7 +1,7 @@
 ---
 id: ios-native
 title: Adding Flipper to iOS apps
-sidebar_label: Adding Flipper to iOS apps
+sidebar_label: Generic iOS apps
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';

docs/getting-started/react-native-android.mdx

@@ -1,7 +1,7 @@
 ---
 id: react-native-android
 title: Manually set up your React Native Android App
-sidebar_label: React Native for Android
+sidebar_label: Manual Android Setup
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';

docs/getting-started/react-native-ios.mdx

@@ -1,7 +1,7 @@
 ---
 id: react-native-ios
 title: Manually set up your React Native iOS App
-sidebar_label: React Native for iOS
+sidebar_label: Manual iOS Setup
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';

docs/getting-started/react-native.mdx

@@ -1,7 +1,7 @@
 ---
 id: react-native
 title: Set up your React Native App
-sidebar_label: React Native
+sidebar_label: Automatic Setup
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';

website/sidebars.js

@@ -7,7 +7,7 @@
  * @format
  */
 
-const {fbInternalOnly} = require('internaldocs-fb-helpers');
+const {fbInternalOnly, fbContent} = require('internaldocs-fb-helpers');
 
 module.exports = {
   features: {
@@ -38,13 +38,35 @@ module.exports = {
   setup: {
     'Getting Started': [
       'getting-started/index',
-      ...fbInternalOnly(['fb/Add-flipper-to-android-app']),
+      {
+        'Adding Flipper to your app': [
+          ...fbContent({
+            external: [
               'getting-started/android-native',
-      ...fbInternalOnly(['fb/Adding-flipper-to-ios-app']),
               'getting-started/ios-native',
+            ],
+            internal: [
+              {
+                Android: [
+                  'fb/Add-flipper-to-android-app',
+                  'getting-started/android-native',
+                ],
+                iOS: [
+                  'fb/Adding-flipper-to-ios-app',
+                  'getting-started/ios-native',
+                ],
+              },
+            ],
+          }),
+          {
+            'React Native': [
               'getting-started/react-native',
               'getting-started/react-native-android',
               'getting-started/react-native-ios',
+            ],
+          },
+        ],
+      },
       'troubleshooting',
       {
         'Other Platforms': [