Canonical url is now in index.html as default.

frontend/src/index.html

@@ -23,6 +23,8 @@
   <link rel="icon" type="image/png" sizes="16x16" href="/resources/favicons/favicon-16x16.png">
   <link rel="manifest" href="/resources/favicons/site.webmanifest">
   <link rel="shortcut icon" href="/resources/favicons/favicon.ico">
+  <link id="canonical" rel="canonical" href="https://mempool.space">
+
   <meta name="msapplication-TileColor" content="#000000">
   <meta name="msapplication-config" content="/resources/favicons/browserconfig.xml">
   <meta name="theme-color" content="#ffffff">