Add a badge on locations for new photos

- The last updated date is taken from the latest photo of each location (without any other API call, just some data manipulation)
- Manipulation of data in the preload request instead of the code

src/atoms/Badge.svelte

@@ -0,0 +1,9 @@
+<script>
+    // Props
+    export let text
+    export let size = 'small'
+</script>
+
+<div class="badge badge--{size}">
+    <span>{text}</span>
+</div>