feat(js): add docs for deepagents-acp in JS (#2988)

Since we now also support ACP in JS, let's document it.

---------

Co-authored-by: Naomi Pentrel <5212232+npentrel@users.noreply.github.com>

Author: 2 people

src/docs.json

@@ -1407,6 +1407,12 @@
                         "oss/javascript/deepagents/frontend/todo-list"
                       ]
                     },
+                    {
+                      "group": "Protocols",
+                      "pages": [
+                        "oss/javascript/deepagents/acp"
+                      ]
+                    },
                     {
                       "group": "Deep Agents CLI",
                       "pages": [