feat: use time el for date strings

for better machine recognition

components/Date.vue

@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import { getPrettyDate, getUtcDate } from "~~/shared/metadata";
+import { BlogParsedContent, StoryParsedContent } from "~~/shared/types";
+
+const props = defineProps<{ doc: StoryParsedContent | BlogParsedContent }>();
+
+const prettyDate = getPrettyDate(props.doc);
+const utcDate = getUtcDate(props.doc);
+</script>
+
+<template>
+  <time pubdate :datetime="utcDate">{{ prettyDate }}</time> ·
+</template>