docs: add 0.2 search notice (#21653)

docs/docusaurus.config.js

@@ -124,7 +124,7 @@ const config = {
     /** @type {import('@docusaurus/preset-classic').ThemeConfig} */
     ({
       announcementBar: {
-        content: 'You are viewing the <strong>preview</strong> LangChain v0.2 docs. View the <a href="/v0.1/docs/get_started/introduction/">stable 0.1 docs here</a>.',
+        content: 'You are viewing the <strong>preview</strong> LangChain v0.2 docs. Note that 0.2 Search features are currently unstable and in progress. View the <a href="/v0.1/docs/get_started/introduction/">stable 0.1 docs here</a>.',
         isCloseable: true,
       },
       docs: {

docs/vercel_requirements.txt

@@ -1,6 +1,5 @@
 -e ../libs/langchain
 -e ../libs/community
--e ../libs/core
 -e ../libs/experimental
 -e ../libs/text-splitters
 langchain-cohere
@@ -10,3 +9,4 @@ langchain-elasticsearch
 langchain-postgres
 urllib3==1.26.18
 nbconvert==7.16.4
+langchain-core==0.1.52