Use options parameters with types and default on smoothScroll function

src/routes/index.svelte

@@ -95,7 +95,7 @@
                 {settings.description}
             </p>
 
-            <Button url="#locations" text="Explore locations" on:click={() => smoothScroll('locations')}>
+            <Button url="#locations" text="Explore locations" on:click={event => smoothScroll({ hash: 'locations', event })}>
                 <IconEarth animate={true} />
             </Button>
         </div>