docs: fix package manager code blocks

packages/www/content/docs/index.mdx

@@ -23,12 +23,25 @@ curl -fsSL https://raw.githubusercontent.com/anomalyco/opencode/v2/install | bas
 
 You can also install it with the following package managers.
 
-<Tabs>
-  <Tab title="npm">```bash npm install -g @opencode-ai/cli@next ```</Tab>
-  <Tab title="bun">```bash bun install -g --trust @opencode-ai/cli@next ```</Tab>
-  <Tab title="pnpm">```bash pnpm add -g --allow-build=@opencode-ai/cli @opencode-ai/cli@next ```</Tab>
-  <Tab title="Yarn">```bash yarn global add @opencode-ai/cli@next ```</Tab>
-</Tabs>
+<CodeGroup>
+
+```bash npm
+npm install -g @opencode-ai/cli@next
+```
+
+```bash bun
+bun install -g --trust @opencode-ai/cli@next
+```
+
+```bash pnpm
+pnpm add -g --allow-build=@opencode-ai/cli @opencode-ai/cli@next
+```
+
+```bash Yarn
+yarn global add @opencode-ai/cli@next
+```
+
+</CodeGroup>
 
 The package uses a trusted postinstall script to select the native `opencode2` binary for your platform. The Bun and pnpm
 commands above explicitly allow that script to run.