fix: fix syntax highlighting in button.md ignored input section

- Use HTML-style component tag instead of MDC inline syntax
- Change code block language from html to vue for proper directive highlighting

Author: andrew-boyd

3.inputs/button.md

@@ -44,10 +44,9 @@ file: "_examples/button/button-events.vue"
 
 ## Ignored input
 
-:IgnoredInputDocs
+<ignored-input-docs></ignored-input-docs>
 
-
-```html
+```vue
 <FormKit type="button" :ignore="false">
   Add a section
 </FormKit>