docs: clarify config behavior and remove theme example

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

@@ -65,7 +65,7 @@ console.log(`Server running at ${server.url}`)
 server.close()
 ```
 
-You can also pass a configuration object to customize the server behavior:
+You can also pass a configuration object to customize the server behavior. The server will still pick up your `opencode.json` file as usual, but you can override or add additional configuration inline:
 
 ```javascript
 import { createOpencodeServer } from "@opencode-ai/sdk"
@@ -74,7 +74,6 @@ const server = await createOpencodeServer({
   hostname: "127.0.0.1",
   port: 4096,
   config: {
-    theme: "dark",
     model: "anthropic/claude-3-5-sonnet-20241022",
     agent: {
       general: {