Update AdventureCard component and add country flag support

src/routes/worldtravel/+page.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
     import { goto } from "$app/navigation";
+    import { getFlag } from "$lib";
     import AdventureCard from "$lib/components/AdventureCard.svelte";
 
     export let data: any;
@@ -7,9 +8,6 @@
     async function nav(loc: string) {
         goto(`/worldtravel/${loc}`);
     }
-    function getFlag(country: string) {
-        return `https://flagcdn.com/h24/${country}.png`;
-    }
 </script>
 
 <h1 class="text-center font-bold text-4xl mb-4">Country List</h1>