Implement web ui

web/src/lib/components/HowItWorksStep.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+    interface Props {
+        step: number;
+        title: string;
+        description: string;
+    }
+
+    let { step, title, description }: Props = $props();
+</script>
+
+<div class="card h-100 text-center p-4">
+    <div class="display-1 text-primary fw-bold opacity-25">{step}</div>
+    <h5 class="fw-bold mt-3">{title}</h5>
+    <p class="text-muted mb-0">
+        {description}
+    </p>
+</div>