chore(docs): Consolidate hooks for copy markdown and notebooks (#5459)

Consolidating the hooks to avoid duplication of logic

We need this change for consolidating js and python content: we need include-markdown to run as a mkdocs plugin before our pipeline (rather than as markdown extension which runs after our hooks plugin).

docs/docs/tutorials/plan-and-execute/plan-and-execute.ipynb

@@ -378,7 +378,7 @@
     "\n",
     "async def execute_step(state: PlanExecute):\n",
     "    plan = state[\"plan\"]\n",
-    "    plan_str = \"\\n\".join(f\"{i+1}. {step}\" for i, step in enumerate(plan))\n",
+    "    plan_str = \"\\n\".join(f\"{i + 1}. {step}\" for i, step in enumerate(plan))\n",
     "    task = plan[0]\n",
     "    task_formatted = f\"\"\"For the following plan:\n",
     "{plan_str}\\n\\nYou are tasked with executing step {1}, {task}.\"\"\"\n",