docs(ai): add AI to sidebar, deprecate Vertex AI, fixup prev/next

Author: mikehardy

docs/ai/usage/index.md

@@ -3,7 +3,7 @@ title: AI Logic
 description: Installation and getting started with Firebase AI Logic.
 icon: //firebase.google.com/static/images/icons/firebase-ai-logic.svg
 next: /analytics/usage
-previous: /remote-config/usage
+previous: /contributing
 ---
 
 # Installation

docs/analytics/usage/index.md

@@ -3,7 +3,7 @@ title: Analytics
 description: Installation and getting started with Analytics.
 icon: //firebase.google.com/static/images/products/icons/run_analytics.svg
 next: /analytics/screen-tracking
-previous: /contributing
+previous: /ai/usage
 ---
 
 # Installation

docs/perf/ky-integration.md

@@ -2,6 +2,7 @@
 title: Performance Monitoring with KY
 description: Monitor HTTP request performance with Firebase Performance Monitoring and KY.
 previous: /perf/axios-integration
+next: /vertexai/usage
 ---
 
 # KY

docs/sidebar.yaml

@@ -17,6 +17,10 @@
   - 'https://invertase.canny.io/react-native-firebase'
 - - Contributing
   - 'https://github.com/invertase/react-native-firebase/blob/main/CONTRIBUTING.md'
+- - AI Logic
+  - - - Usage
+      - '/ai/usage'
+  - '//firebase.google.com/static/images/icons/firebase-ai-logic.svg'
 - - Analytics
   - - - Usage
       - '/analytics/usage'