Add explicit identifier to book page & cards

Author: opatry

content/index.html.erb

@@ -18,7 +18,7 @@ unless books.empty?
 
       <a href="<%= book.path %>"><img src="<%= cover.path(rep: :medium) %>" width="<%= cover["width_medium"] %>" class="book-cover-card"></a>
       <% end %>
-      <div class="book-info" title="<%= "#{book[:title]} de #{book[:author]}"%>">
+      <div id="book-<%= book[:isbn] %>" class="book-info" title="<%= "#{book[:title]} de #{book[:author]}"%>">
         <div class="book-header">
           <h2 class="book-title"><a href="<%= book.path %>"><%= book[:title] %></a></h2>
           <% if book[:favorite] || false %>

layouts/book.html.erb

@@ -1,3 +1,4 @@
+<div id="<%= "book-#{item[:isbn]}" %>">
 <h2 class="book-title">
 <%= @item[:title] %>
 <% if @item[:favorite] || false %>
@@ -37,3 +38,4 @@ unless @item.fetch(:linked_books, []).empty?
 <% end %>
 </ul>
 <% end %>
+</div>