docs(app): put back carbon ads

docs/app/components/AdsCarbon.vue

@@ -0,0 +1,50 @@
+<script setup lang="ts">
+const el = ref<HTMLDivElement | null>(null)
+
+onMounted(() => {
+  if (!el.value) {
+    return
+  }
+
+  const script = document.createElement('script')
+  script.setAttribute('type', 'text/javascript')
+  script.setAttribute('src', 'https://cdn.carbonads.com/carbon.js?serve=CWYIVK3E&placement=uinuxtcom')
+  script.setAttribute('id', '_carbonads_js')
+
+  el.value?.appendChild(script)
+})
+</script>
+
+<template>
+  <div ref="el" class="carbon" />
+</template>
+
+<style scoped>
+@reference "../assets/css/main.css";
+
+.carbon :deep(#carbonads) {
+  @apply relative border border-(--ui-border) rounded-[calc(var(--ui-radius)*1.5)] hover:bg-(--ui-bg-elevated)/50 w-full transition-colors min-h-[220px] p-2;
+
+  .carbon-img {
+    @apply flex justify-center w-full;
+
+    & > img {
+      @apply !max-w-full w-full rounded-(--ui-radius);
+    }
+  }
+
+  .carbon-text {
+    @apply text-sm text-(--ui-text-muted) transition-colors text-center text-pretty flex pt-2;
+  }
+
+  .carbon-poweredby {
+    @apply block text-[10px] text-center text-(--ui-text-dimmed) pt-2;
+  }
+
+  &:hover {
+    .carbon-text {
+      @apply text-(--ui-text);
+    }
+  }
+}
+</style>