Improve ChatQnA flowchat according to feedback (#736)

Signed-off-by: Tsai, Louie <louie.tsai@intel.com>

ChatQnA/README.md

@@ -14,12 +14,11 @@ The ChatQnA example is implemented using the component-level microservices defin
 ---
 config:
   flowchart:
-    nodeSpacing: 100
+    nodeSpacing: 400
     rankSpacing: 100
     curve: linear
-  theme: base
   themeVariables:
-    fontSize: 42px
+    fontSize: 50px
 ---
 flowchart LR
     %% Colors %%
@@ -28,67 +27,60 @@ flowchart LR
     classDef orchid fill:#C26DBC,stroke:#ADD8E6,stroke-width:2px,fill-opacity:0.5
     classDef invisible fill:transparent,stroke:transparent;
     style ChatQnA-MegaService stroke:#000000
+
     %% Subgraphs %%
-    subgraph ChatQnA-MegaService["ChatQnA-MegaService"]
+    subgraph ChatQnA-MegaService["ChatQnA MegaService "]
         direction LR
-        EM([Embedding <br>]):::blue
-        RET([Retrieval <br>]):::blue
-        RER([Rerank <br>]):::blue
-        LLM([LLM <br>]):::blue
+        EM([Embedding MicroService]):::blue
+        RET([Retrieval MicroService]):::blue
+        RER([Rerank MicroService]):::blue
+        LLM([LLM MicroService]):::blue
     end
-    subgraph User Interface
-        direction TB
+    subgraph UserInterface[" User Interface "]
+        direction LR
         a([User Input Query]):::orchid
         Ingest([Ingest data]):::orchid
         UI([UI server<br>]):::orchid
     end
-    subgraph ChatQnA GateWay
-        direction LR
-        invisible1[ ]:::invisible
-        GW([ChatQnA GateWay<br>]):::orange
-    end
-    subgraph .
-        X([OPEA Micsrservice]):::blue
-        Y{{Open Source Service}}
-        Z([OPEA Gateway]):::orange
-        Z1([UI]):::orchid
-    end
+
+
 
     TEI_RER{{Reranking service<br>}}
     TEI_EM{{Embedding service <br>}}
     VDB{{Vector DB<br><br>}}
     R_RET{{Retriever service <br>}}
-    DP([Data Preparation<br>]):::blue
+    DP([Data Preparation MicroService]):::blue
     LLM_gen{{LLM Service <br>}}
+    GW([ChatQnA GateWay<br>]):::orange
 
     %% Data Preparation flow
     %% Ingest data flow
     direction LR
-    Ingest[Ingest data] -->|a| UI
-    UI -->|b| DP
-    DP <-.->|c| TEI_EM
+    Ingest[Ingest data] --> UI
+    UI --> DP
+    DP <-.-> TEI_EM
 
     %% Questions interaction
     direction LR
-    a[User Input Query] -->|1| UI
-    UI -->|2| GW
-    GW <==>|3| ChatQnA-MegaService
-    EM ==>|4| RET
-    RET ==>|5| RER
-    RER ==>|6| LLM
+    a[User Input Query] --> UI
+    UI --> GW
+    GW <==> ChatQnA-MegaService
+    EM ==> RET
+    RET ==> RER
+    RER ==> LLM
 
 
     %% Embedding service flow
-    direction TB
-    EM <-.->|3'| TEI_EM
-    RET <-.->|4'| R_RET
-    RER <-.->|5'| TEI_RER
-    LLM <-.->|6'| LLM_gen
+    direction LR
+    EM <-.-> TEI_EM
+    RET <-.-> R_RET
+    RER <-.-> TEI_RER
+    LLM <-.-> LLM_gen
 
     direction TB
     %% Vector DB interaction
-    R_RET <-.->|d|VDB
-    DP <-.->|d|VDB
+    R_RET <-.->VDB
+    DP <-.->VDB