fix version badge margin

Author: mbostock

docs/.vitepress/theme/VersionBadge.vue

@@ -3,6 +3,13 @@
 const {version, pr} = defineProps(["version", "pr"]);
 
 </script>
+<style>
+
+.VPBadge {
+  margin: -2px 0;
+}
+
+</style>
 <template>
   <Badge v-if="version || pr" :type="version ? `tip` : `warning`">
     <a :href="version ? `https://github.com/observablehq/plot/releases/tag/v${version}` : `https://github.com/observablehq/plot/pull/${pr}`" :title="version ? `added in v${version}` : `added in #${pr}`" target="_blank" rel="external" style="color: inherit;">