docs: v0.2 docs in master (#21438)

current python.langchain.com is building from branch `v0.1`. Iterate on
v0.2 docs here.

---------

Signed-off-by: Weichen Xu <weichen.xu@databricks.com>
Signed-off-by: Rahul Tripathi <rauhl.psit.ec@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: jacoblee93 <jacoblee93@gmail.com>
Co-authored-by: Leonid Ganeline <leo.gan.57@gmail.com>
Co-authored-by: Leonid Kuligin <lkuligin@yandex.ru>
Co-authored-by: Averi Kitsch <akitsch@google.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Nuno Campos <nuno@boringbits.io>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Martín Gotelli Ferenaz <martingotelliferenaz@gmail.com>
Co-authored-by: Fayfox <admin@fayfox.com>
Co-authored-by: Eugene Yurtsev <eugene@langchain.dev>
Co-authored-by: Dawson Bauer <105886620+djbauer2@users.noreply.github.com>
Co-authored-by: Ravindu Somawansa <ravindu.somawansa@gmail.com>
Co-authored-by: Dhruv Chawla <43818888+Dominastorm@users.noreply.github.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: WeichenXu <weichen.xu@databricks.com>
Co-authored-by: Benito Geordie <89472452+benitoThree@users.noreply.github.com>
Co-authored-by: kartikTAI <129414343+kartikTAI@users.noreply.github.com>
Co-authored-by: Kartik Sarangmath <kartik@thirdai.com>
Co-authored-by: Sevin F. Varoglu <sfvaroglu@octoml.ai>
Co-authored-by: MacanPN <martin.triska@gmail.com>
Co-authored-by: Prashanth Rao <35005448+prrao87@users.noreply.github.com>
Co-authored-by: Hyeongchan Kim <kozistr@gmail.com>
Co-authored-by: sdan <git@sdan.io>
Co-authored-by: Guangdong Liu <liugddx@gmail.com>
Co-authored-by: Rahul Triptahi <rahul.psit.ec@gmail.com>
Co-authored-by: Rahul Tripathi <rauhl.psit.ec@gmail.com>
Co-authored-by: pjb157 <84070455+pjb157@users.noreply.github.com>
Co-authored-by: Eun Hye Kim <ehkim1440@gmail.com>
Co-authored-by: kaijietti <43436010+kaijietti@users.noreply.github.com>
Co-authored-by: Pengcheng Liu <pcliu.fd@gmail.com>
Co-authored-by: Tomer Cagan <tomer@tomercagan.com>
Co-authored-by: Christophe Bornet <cbornet@hotmail.com>

docs/docusaurus.config.js

@@ -18,10 +18,10 @@ const config = {
   url: "https://python.langchain.com",
   // Set the /<baseUrl>/ pathname under which your site is served
   // For GitHub pages deployment, it is often '/<projectName>/'
-  baseUrl: "/",
+  baseUrl: "/v0.2/",
   trailingSlash: true,
-  onBrokenLinks: "throw",
-  onBrokenMarkdownLinks: "throw",
+  onBrokenLinks: "warn",
+  onBrokenMarkdownLinks: "warn",
 
   themes: ["@docusaurus/theme-mermaid"],
   markdown: {
@@ -118,6 +118,10 @@ const config = {
   themeConfig:
     /** @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>.',
+        isCloseable: true,
+      },
       docs: {
         sidebar: {
           hideable: true,
@@ -148,22 +152,12 @@ const config = {
       navbar: {
         logo: {src: "img/brand/wordmark.png", srcDark: "img/brand/wordmark-dark.png"},
         items: [
-          {
-            to: "/docs/modules",
-            label: "Components",
-            position: "left",
-          },
           {
             type: "docSidebar",
             position: "left",
             sidebarId: "integrations",
             label: "Integrations",
           },
-          {
-            to: "/docs/guides",
-            label: "Guides",
-            position: "left",
-          },
           {
             href: "https://api.python.langchain.com",
             label: "API Reference",
@@ -175,15 +169,18 @@ const config = {
             position: "left",
             items: [
               {
-                to: "/docs/people/",
+                type: "doc",
+                docId: "people",
                 label: "People",
               },
               {
-                to: "/docs/packages",
+                type: "doc",
+                docId: "packages",
                 label: "Versioning",
               },
               {
-                to: "/docs/contributing",
+                type: "doc",
+                docId: "contributing/index",
                 label: "Contributing",
               },
               {
@@ -196,11 +193,13 @@ const config = {
                 href: "https://github.com/langchain-ai/langchain/blob/master/cookbook/README.md"
               },
               {
-                to: "/docs/additional_resources/tutorials",
+                type: "doc",
+                docId: "additional_resources/tutorials",
                 label: "Tutorials"
               },
               {
-                to: "/docs/additional_resources/youtube",
+                type: "doc",
+                docId: "additional_resources/youtube",
                 label: "YouTube"
               },
             ]