rename main code directory

bookwyrm/templates/snippets/book_cover.html

@@ -0,0 +1,12 @@
+{% load fr_display %}
+{% if book.cover %}
+<img class="book-cover {{ size }}" src="/images/{{ book.cover }}" alt="{% include 'snippets/cover_alt.html' with book=book %}">
+{% else %}
+<div class="no-cover book-cover {{ size }}">
+    <img class="book-cover {{ size }}" src="/static/images/no_cover.jpg" alt="No cover">
+    <div>
+        <p class="title">{{ book.title }}</p>
+        <p>({{ book|edition_info }})</p>
+    </div>
+</div>
+{% endif %}