docs(ai): hide broken LLM API reference (#674)

This commit hides the LLM api reference, since it does require a hot fix
to work. We should improve the generation at the speakeasy side so that
we don't have to manually change the included OpenAPI spec (see
https://linear.app/livepeer-ai/issue/AI-622/fix-llm-input-type-documentation).

mint.json

@@ -601,7 +601,6 @@
             "ai/api-reference/text-to-image",
             "ai/api-reference/image-to-image",
             "ai/api-reference/image-to-video",
-            "ai/api-reference/llm",
             "ai/api-reference/segment-anything-2",
             "ai/api-reference/upscale"
           ]
@@ -953,4 +952,4 @@
       "measurementId": "G-P1Z15F6NX4"
     }
   }
-}
+}