create-rescript-app does not have themes, but templates

Author: fhammerschmidt

pages/docs/manual/latest/installation.mdx

@@ -44,7 +44,7 @@ bun create rescript-app
   ```sh
   npm run res:build
   ```
-- If you selected the basic theme, simply run it with:
+- If you selected the "basic" template, simply run it with:
   ```sh
   node src/Demo.res.js
   ```