analytics + improve GTFS importer

src/components/MbtaLine.svelte

@@ -1,5 +1,5 @@
 <script>
-  import agency from "../../cities/boston.json"
+  import agency from "../agency"
 
   export let name
   export let compact = false

src/pages/index.astro

@@ -7,6 +7,17 @@ import screenshot from "../screenshot.png";
   <head>
     <link rel="preload" as="image" href={screenshot.src} />
     <title>The Boston Train Quiz</title>
+
+    {
+      import.meta.env.PROD && (
+        <script
+          is:inline
+          defer
+          src="https://cloud.umami.is/script.js"
+          data-website-id="3c0255b3-e006-4147-8fc3-5d87b9160e7b"
+        />
+      )
+    }
   </head>
   <body>
     <Guesser client:load />