Update first-server.mdx: clarify cwd requirement (#14)

src/content/docs/guides/first-server.mdx

@@ -105,7 +105,7 @@ Since this guide mainly focuses on creating a server we'll start by creating the
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-We'll also be installing a few dependencies from Volar and VS Code. Run the following command to install them:
+We'll also be installing a few dependencies from Volar and VS Code. Run the following command from the `packages/client` folder to install them:
 
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