feat: add pager for article navigation in section

chore: minor updates

- reorg language settings
- add icons for cards and steps

chore: update about page

chore: add style to kbd

layouts/docs/list.html

@@ -9,6 +9,8 @@
           <h1>{{ .Title }}</h1>
           {{ .Content }}
         </div>
+        <div class="mt-16"></div>
+        {{ partial "pager.html" . }}
       </main>
     </article>
   </div>