chore(da-cli): use short link (#3817)

Author: mdrxy

src/oss/deepagents/cli/overview.mdx

@@ -106,12 +106,12 @@ The Deep Agents CLI has the following built-in capabilities:
 
         <CodeGroup>
             ```bash Script
-            curl -LsSf https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/cli/scripts/install.sh | bash
+            curl -LsSf https://langch.in/gh-da-cli | bash
             ```
 
             ```bash Optional extras
             # OpenAI, Anthropic, and Gemini are included by default
-            DEEPAGENTS_EXTRAS="ollama,groq" curl -LsSf https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/cli/scripts/install.sh | bash
+            DEEPAGENTS_EXTRAS="ollama,groq" curl -LsSf https://langch.in/gh-da-cli | bash
             ```
 
             ```bash uv

src/oss/deepagents/cli/providers.mdx

@@ -16,7 +16,7 @@ The CLI integrates automatically with the [following model providers](#provider-
     ```bash
     # Quick install with chosen providers
     # OpenAI, Anthropic, and Gemini are included by default
-    DEEPAGENTS_EXTRAS="baseten,groq" curl -LsSf https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/cli/scripts/install.sh | bash
+    DEEPAGENTS_EXTRAS="baseten,groq" curl -LsSf https://langch.in/gh-da-cli | bash
 
     # Or install directly with uv
     uv tool install 'deepagents-cli[baseten,groq]'