Update index.mdx (#475)

Author: hey-august

website/docs/main/home/calling/voice/index.mdx

@@ -66,7 +66,7 @@ SignalWire's advanced APIs and elastic cloud infrastructure make it a breeze to
 ## Low-code and no-code solutions
 
 <CardGroup>
-  <Card title="Call Flow Builder" icon={<MdDragIndicator/>} href="/swml">
+  <Card title="Call Flow Builder" icon={<MdDragIndicator/>} href="/call-flow-builder">
     Drag-and-drop, no-code call application builder
   </Card>
   <Card title="SWML" icon={<MdCode/>} href="/swml">
@@ -96,4 +96,4 @@ SignalWire's advanced APIs and elastic cloud infrastructure make it a breeze to
 
 {/* Core links */}
 [cxml]: /compatibility-api/cxml
-[cfb]: /call-flow-builder
+[cfb]: /call-flow-builder