docs: lots of improvements

docs/content/2.elements/6.kbd.md

@@ -0,0 +1,49 @@
+---
+github: true
+title: 'Keyboard Key'
+navigation:
+  title: 'Kbd'
+---
+
+## Usage
+
+::component-example
+#default
+:kbd-example
+
+#code
+```vue
+<script setup>
+const { metaSymbol } = useShortcuts()
+</script>
+
+<template>
+  <div class="flex items-center gap-0.5">
+    <UKbd>{{ metaSymbol }}</UKbd>
+    <UKbd>U</UKbd>
+  </div>
+</template>
+```
+::
+
+### Size
+
+Use the `size` prop to change the size of the Kbd.
+
+::component-card
+---
+props:
+  size: 'sm'
+code: 'U'
+---
+
+U
+::
+
+## Props
+
+:component-props
+
+## Preset
+
+:component-preset