(new docs): fix links (#21345)

docs/versioned_docs/version-0.2.x/how_to/agent_executor.ipynb

@@ -66,7 +66,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_docs/version-0.2.x/installation.mdx

@@ -0,0 +1,89 @@
+---
+sidebar_position: 2
+---
+
+# Installation
+
+## Official release
+
+To install LangChain run:
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+import CodeBlock from "@theme/CodeBlock";
+
+<Tabs>
+  <TabItem value="pip" label="Pip" default>
+    <CodeBlock language="bash">pip install langchain</CodeBlock>
+  </TabItem>
+  <TabItem value="conda" label="Conda">
+    <CodeBlock language="bash">conda install langchain -c conda-forge</CodeBlock>
+  </TabItem>
+</Tabs>
+
+This will install the bare minimum requirements of LangChain.
+A lot of the value of LangChain comes when integrating it with various model providers, datastores, etc.
+By default, the dependencies needed to do that are NOT installed. You will need to install the dependencies for specific integrations separately.
+
+## From source
+
+If you want to install from source, you can do so by cloning the repo and be sure that the directory is `PATH/TO/REPO/langchain/libs/langchain` running:
+
+```bash
+pip install -e .
+```
+
+## LangChain core
+The `langchain-core` package contains base abstractions that the rest of the LangChain ecosystem uses, along with the LangChain Expression Language. It is automatically installed by `langchain`, but can also be used separately. Install with:
+
+```bash
+pip install langchain-core
+```
+
+## LangChain community
+The `langchain-community` package contains third-party integrations. It is automatically installed by `langchain`, but can also be used separately. Install with:
+
+```bash
+pip install langchain-community
+```
+
+## LangChain experimental
+The `langchain-experimental` package holds experimental LangChain code, intended for research and experimental uses.
+Install with:
+
+```bash
+pip install langchain-experimental
+```
+
+## LangGraph
+`langgraph` is a library for building stateful, multi-actor applications with LLMs, built on top of (and intended to be used with) LangChain.
+Install with:
+
+```bash
+pip install langgraph
+```
+## LangServe
+LangServe helps developers deploy LangChain runnables and chains as a REST API.
+LangServe is automatically installed by LangChain CLI.
+If not using LangChain CLI, install with:
+
+```bash
+pip install "langserve[all]"
+```
+for both client and server dependencies. Or `pip install "langserve[client]"` for client code, and `pip install "langserve[server]"` for server code.
+
+## LangChain CLI
+The LangChain CLI is useful for working with LangChain templates and other LangServe projects.
+Install with:
+
+```bash
+pip install langchain-cli
+```
+
+## LangSmith SDK
+The LangSmith SDK is automatically installed by LangChain.
+If not using LangChain, install with:
+
+```bash
+pip install langsmith
+```

docs/versioned_docs/version-0.2.x/tutorials/agents.ipynb

@@ -63,7 +63,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_docs/version-0.2.x/tutorials/chatbot.ipynb

@@ -75,7 +75,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_docs/version-0.2.x/tutorials/extraction.ipynb

@@ -65,7 +65,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_docs/version-0.2.x/tutorials/llm_chain.ipynb

@@ -64,7 +64,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_docs/version-0.2.x/tutorials/sql_qa.ipynb

@@ -117,7 +117,7 @@
     "\n",
     "## Chains {#chains}\n",
     "\n",
-    "Chains (i.e., compositions of LangChain [Runnables](/docs/expression_language/)) support applications whose steps are predictable. We can create a simple chain that takes a question and does the following:\n",
+    "Chains (i.e., compositions of LangChain [Runnables](/docs/concepts#langchain-expression-language)) support applications whose steps are predictable. We can create a simple chain that takes a question and does the following:\n",
     "- convert the question into a SQL query;\n",
     "- execute the query;\n",
     "- use the result to answer the original question.\n",

docs/versioned_docs/version-0.2.x/tutorials/summarization.ipynb

@@ -87,7 +87,7 @@
     "```\n",
     "\n",
     "\n",
-    "For more details, see our [Installation guide](/docs/get_started/installation).\n",
+    "For more details, see our [Installation guide](/docs/installation).\n",
     "\n",
     "### LangSmith\n",
     "\n",

docs/versioned_sidebars/version-0.2.x-sidebars.json

@@ -1,6 +1,15 @@
 {
   "docs": [
-    "introduction",
+    {
+      "type": "category",
+      "label": "Introduction",
+      "collapsed": false,
+      "collapsible": false,
+      "link": {"type": "doc", "id": "introduction"},
+      "items": [
+        "installation"
+      ]
+    },
     {
       "type": "doc",
       "id": "tutorials/index",