directory for shelve button templates

bookwyrm/templates/snippets/book_preview.html

@@ -3,7 +3,7 @@
     <div class="column is-narrow">
         <div>
         <a href="/book/{{ book.id }}">{% include 'snippets/book_cover.html' with book=book %}</a>
-        {% include 'snippets/shelve_button.html' with book=book %}
+        {% include 'snippets/shelve_button/shelve_button.html' with book=book %}
         </div>
     </div>
     <div class="column">

bookwyrm/templates/snippets/book_tiles.html

@@ -5,7 +5,7 @@
             <a href="/book/{{ book.id }}">
                 {% include 'snippets/book_cover.html' with book=book %}
             </a>
-            {% include 'snippets/shelve_button.html' with book=book switch_mode=True %}
+            {% include 'snippets/shelve_button/shelve_button.html' with book=book switch_mode=True %}
         </div>
     </div>
     {% endfor %}