Yay lazy loading

At long last.

src/components/lazy-loader/Placeholder.svelte

@@ -0,0 +1,15 @@
+{#if placeholder}
+  <div class={placeholderClass}>
+    {#if typeof placeholder === 'string'}
+      <div>{placeholder}</div>
+    {:else if ['function', 'object'].includes(typeof placeholder)}
+      <svelte:component this={placeholder} {...placeholderProps} />
+    {/if}
+  </div>
+{/if}
+
+<script>
+  export let placeholder = null;
+  export let placeholderProps = null;
+  const placeholderClass = 'svelte-lazy-placeholder';
+</script>