Add side navigation for 3.10 (latest) docs

Add side navigation for 3.10 (`latest`) docs, and change the former `latest` navigation to `3.9`.

_data/navigation.yml

@@ -36,8 +36,10 @@ versions:
     version-children:
     - version-title: "Licensed version"
       version-url: "https://scalardb.scalar-labs.com/docs"
-    - version-title: "3.9 Community (latest)"
+    - version-title: "3.10 Community (latest)"
       version-url: /docs/latest
+    - version-title: "3.9 Community"
+      version-url: /docs/3.9
     - version-title: "3.8 Community"
       version-url: /docs/3.8
     - version-title: "3.7 Community"
@@ -60,7 +62,7 @@ versions:
 "latest":
   - title: "⬅ ScalarDB Community docs home" 
     url: /docs # Don't change this URL. This links back to the parent product home page.
-  - title: "ScalarDB 3.9 Community"
+  - title: "ScalarDB 3.10 Community"
     children:
   # Get Started docs
   - title: "Get Started"
@@ -128,6 +130,77 @@ versions:
       - title: "ScalarDB Benchmarks"
         url: /docs/latest/scalardb-benchmarks/README/
 
+"3.9":
+  - title: "⬅ ScalarDB Community docs home" 
+    url: /docs # Don't change this URL. This links back to the parent product home page.
+  - title: "ScalarDB 3.9 Community"
+    children:
+  # Get Started docs
+  - title: "Get Started"
+    children:
+      - title: "Setting Up Your Database Environment"
+        url: /docs/3.9/getting-started/
+      # - title: "Getting Started with ScalarDB on Cassandra"
+      #   url: /docs/3.9/getting-started-with-scalardb-on-cassandra/
+      # - title: "Getting Started with ScalarDB on Cosmos DB"
+      #   url: /docs/3.9/getting-started-with-scalardb-on-cosmosdb/
+      # - title: "Getting Started with ScalarDB on DynamoDB"
+      #   url: /docs/3.9/getting-started-with-scalardb-on-dynamodb/
+      # - title: "Getting Started with ScalarDB on JDBC databases"
+      #   url: /docs/3.9/getting-started-with-scalardb-on-jdbc/
+      - title: "Getting Started with ScalarDB"
+        url: /docs/3.9/getting-started-with-scalardb/
+  # Samples docs
+  - title: "Samples" 
+    children:
+      - title: "ScalarDB Samples" 
+        url: /docs/3.9/scalardb-samples/README/
+      # - title: "ScalarDB Samples"
+      #   url: /docs/3.9/scalardb-samples/scalardb-sample/README/
+      # - title: "Microservice Transaction Sample"
+      #   url: /docs/3.9/scalardb-samples/microservice-transaction-sample/README/
+      # - title: "Multi-Storage Transaction Sample"
+      #   url: /docs/3.9/scalardb-samples/multi-storage-transaction-sample/README/
+  # Develop docs
+  - title: "Develop"
+    children:
+      - title: "Add ScalarDB to your build"
+        url: /docs/3.9/add-scalardb-to-your-build/
+      - title: "ScalarDB Java API Guide"
+        url: /docs/3.9/api-guide/
+      - title: "Configuration Guides for ScalarDB"
+        url: /docs/3.9/development-configurations/
+      - title: "ScalarDB Schema Loader"
+        url: /docs/3.9/schema-loader/
+  # Deploy docs
+  - title: "Deploy"
+    children:
+      - title: "ScalarDB Server"
+        url: /docs/3.9/scalardb-server/
+  # Manage docs
+  - title: "Manage"
+    children:
+      - title: "How to Backup and Restore Databases Used Through ScalarDB"
+        url: /docs/3.9/backup-restore/
+  # Migrate docs
+  # - title: "Migrate"
+  #   children:
+  #     - title: ""
+  #       url: 
+  # Reference docs
+  - title: "Reference"
+    children:      
+      - title: "ScalarDB Design Document"
+        url: /docs/3.9/design/
+      - title: "ScalarDB Supported Databases"
+        url: /docs/3.9/scalardb-supported-databases/
+      - title: "Requirements in the Underlying Databases of ScalarDB"
+        url: /docs/3.9/requirements/
+      - title: "Storage Abstraction"
+        url: /docs/3.9/storage-abstraction/
+      - title: "ScalarDB Benchmarks"
+        url: /docs/3.9/scalardb-benchmarks/README/
+
 "3.8":
   - title: "⬅ ScalarDB Community docs home" 
     url: /docs # Don't change this URL. This links back to the parent product home page.