style: update wiki data badge layout

- Wrap badge content in a div for better layout.
- Maintain existing functionality and styling while improving structure.

This change enhances the HTML structure of the wiki data badge by
encapsulating the link in a div element, which aids in layout
management without altering the way the component functions or
displays.

app/views/shared/_wiki_data_badge.html.erb

@@ -1,4 +1,5 @@
 <% if city.wiki_data_id.present? %>
+  <div class="badge badge-lg badge-ghost">
     <%= link_to "https://www.wikidata.org/wiki/#{city.wiki_data_id}",
                 target: "_blank",
                 rel: "noopener noreferrer",
@@ -9,4 +10,5 @@
       </svg>
       <%= t("text.wiki_data") %>
     <% end %>
+  </div>
 <% end %>