fixed sources references. set VectorStore as only option available for Semantic kernel

Author: dantelmomsft

app/backend/src/main/java/com/microsoft/openai/samples/rag/retrieval/semantickernel/AzureAISearchVectorStoreUtils.java

@@ -139,7 +139,7 @@ public static List<ContentSource> buildSources(List<DocumentRecord> memoryResult
                 .stream()
                 .map(result -> {
                     return new ContentSource(
-                            result.getSourceFile(),
+                            result.getSourcePage(),
                             result.getContent()
                     );
                 })

app/frontend/src/pages/chat/Chat.tsx

@@ -254,11 +254,11 @@ const Chat = () => {
         {
             key: Approaches.JAVA_SEMANTIC_KERNEL,
             text: "Java Semantic Kernel"
-        },
+        }/**,
         {
             key: Approaches.JAVA_SEMANTIC_KERNEL_PLANNER,
             text: "Java Semantic Kernel - Chains"
-        },
+        },*/
     ];
 
     return (