Revert "add links to Colab & NB viewer"

This reverts commit 87e7e84.

Author: junefish

learn/generation/langchain/managing_rag_docs_langchain.ipynb

@@ -1,12 +1,3 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/pinecone-io/examples/blob/master/learn/generation/langchain/managing_rag_docs_langchain.ipynb) [![Open nbviewer](https://raw.githubusercontent.com/pinecone-io/examples/master/assets/nbviewer-shield.svg)](https://nbviewer.org/github/pinecone-io/examples/blob/master/learn/generation/langchain/managing_rag_docs_langchain.ipynb)"
-   ]
-  },
 {
   "nbformat": 4,
   "nbformat_minor": 0,
@@ -388,4 +379,4 @@
       ]
     }
   ]
-}
+}