#39, Add expand and tabs shortcodes

layouts/shortcodes/tabs.html

@@ -0,0 +1,19 @@
+{{ if .Inner }}{{ end }}
+{{ $id := .Get 0 }}
+{{ $group := printf "tabs-%s" $id }}
+
+<div class="book-tabs">
+  <div class="book-tabs-head">
+  {{ range $index, $tab :=  .Scratch.Get $group}}
+    <label for="{{ printf "%s-%d" $group $index }}">
+      <span>{{ $tab.Name }}</span>
+    </label>
+  {{ end }}
+  </div>
+  {{ range $index, $tab := .Scratch.Get $group}}
+  <input type="radio" name="{{ $group }}" style="display: none;" id="{{ printf "%s-%d" $group $index }}" {{ if not $index }}checked="checked"{{ end }} />
+  <div class="book-tabs-content markdown-inner">
+    <span>{{ .Content | markdownify }}</span>
+  </div>
+  {{ end }}
+</div>