docs: add modes to sidebar

packages/web/src/content/docs/docs/modes.mdx

@@ -1,6 +1,6 @@
 ---
 title: Modes
-description: Configure different modes for different use cases.
+description: Different modes for different use cases.
 ---
 
 Modes in opencode allow you to customize the behavior, tools, and prompts for different use cases. You can switch between modes during a session or configure them in your config file.