[docs] Move legacy Airbyte Cloud docs

Author: maximearmstrong

docs/content/_navigation.json

@@ -922,15 +922,19 @@
     "children": [
       {
         "title": "Airbyte",
-        "path": "/integrations/airbyte",
+        "path": "/integrations/airbyte/airbyte",
         "children": [
           {
             "title": "Airbyte & Dagster",
-            "path": "/integrations/airbyte"
+            "path": "/integrations/airbyte/airbyte"
           },
           {
             "title": "Airbyte Cloud & Dagster",
-            "path": "/integrations/airbyte-cloud"
+            "path": "/integrations/airbyte/airbyte-cloud"
+          },
+          {
+            "title": "Airbyte Cloud & Dagster (Legacy)",
+            "path": "/integrations/airbyte/airbyte-cloud-legacy"
           }
         ]
       },

docs/content/integrations/airbyte-cloud.mdx renamed to docs/content/integrations/airbyte/airbyte-cloud-legacy.mdx

@@ -1,9 +1,9 @@
 ---
-title: "Airbyte Cloud & Dagster | Dagster Docs"
+title: "Airbyte Cloud & Dagster | Dagster Docs (Legacy)"
 description: Integrate your Airbyte Cloud connections into Dagster.
 ---
 
-# Airbyte Cloud & Dagster
+# Airbyte Cloud & Dagster (Legacy)
 
 <Note>
   Using self-hosted Airbyte? Check out the{" "}