update langchain retriever to be scoped package

Author: lucasjacks0n

examples/langchainExample.ts examples/langchainRag.tsexamples/langchainExample.ts renamed to examples/langchainRag.ts

@@ -5,7 +5,8 @@ import {
 } from "@langchain/core/runnables";
 import { PromptTemplate } from "@langchain/core/prompts";
 import { StringOutputParser } from "@langchain/core/output_parsers";
-import { IndexifyClient, IndexifyRetriever } from "getindexify";
+import { IndexifyClient } from "getindexify";
+import { IndexifyRetriever } from "@getindexify/langchain";
 import { formatDocumentsAsString } from "langchain/util/document";
 
 (async () => {
@@ -21,6 +22,7 @@ import { formatDocumentsAsString } from "langchain/util/document";
 
   await new Promise((r) => setTimeout(r, 5000));
 
+  // setup retriever
   const retriever = new IndexifyRetriever(client, {
     name: "minilml6.embedding",
     topK: 9,