Layouts
Create a layout:
---const { title } = Astro.props;---<html>  <head>    <title>{title}</title>  </head>  <body>    <header><a href="/">Home</a></header>    <main>      <slot />    </main>  </body>  </html>Use from a page:
---import BaseLayout from "../layouts/BaseLayout.astro";---<BaseLayout title="My Page">  <h1>Hello</h1>  <p>Welcome!</p></BaseLayout>