remove direct line speech docs

Author: eric-urban

articles/ai-services/.openpublishing.redirection.ai-services.json

@@ -825,16 +825,6 @@
       "redirect_url": "/azure/ai-services/speech-service/voice-assistants",
       "redirect_document_id": false
     },
-
-    - name: Direct Line Speech
-    items:
-      - name: Direct Line Speech overview
-        href: direct-line-speech.md
-      - name: Custom voice assistant quickstart
-        href: quickstarts/voice-assistants.md
-      - name: Voice enable your bot
-        href: tutorial-voice-enable-your-bot-speech-sdk.md
-
     {
       "source_path_from_root": "/articles/ai-services/qnamaker/how-to/migrate-to-openai.md",
       "redirect_url": "/azure/ai-services/qnamaker/overview/overview",