specify canonical urls

Author: mihar-22

src/layouts/app-layout.astro

@@ -25,6 +25,7 @@ const { title, description, announcementBar, breadcrumbBar } = Astro.props;
     <meta name="viewport" content="width=device-width,initial-scale=1" />
     <meta name="generator" content={Astro.generator} />
     <meta name="theme-color" content="#000" />
+    <link rel="canonical" href={Astro.url.toString()} />
     <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
     <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
     <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />