[docs] Template moulding in docs/platform and index improvement (#3663)

docs/templates/integration_guide_template.mdx

@@ -45,11 +45,11 @@ Combine Mem0’s memory layer with [Partner] to [describe the joint outcome].
   [Use only if access is gated or breaking changes exist. Delete when not needed.]
 </Warning>
 
-<!-- Optional architecture diagram -->
+{/* Optional architecture diagram */}
 ```mermaid
 graph LR
-  A[Mem0] --> B[Connector]
-  B --> C[Partner workflow]
+  A[Mem0] */} B[Connector]
+  B */} C[Partner workflow]
 ```
 
 ## Configure credentials
@@ -170,7 +170,7 @@ partner.registerTool("recallPreferences", async (userId: string) => {
 - **[Issue]** — `[Fix or link to partner docs]`
 - **[Issue]** — `[Fix or link to Mem0 troubleshooting guide]`
 
-<!-- DEBUG: verify CTA targets -->
+{/* DEBUG: verify CTA targets */}
 
 <CardGroup cols={2}>
   <Card