cover: tweak styles:

- `optimizeQuality` > `smooth` (CSS language evolution)
- Use `auto` instead of a fixed width.
- Add exceptions for heights and apply them to some previously modified templates.
- Remove `is-large` exception.
- Widen the content column on list curation.

bookwyrm/templates/snippets/book_cover.html

@@ -6,9 +6,6 @@
 <figure
     class="
         cover-container
-        is-clipped
-        is-flex
-        is-align-items-center
         {{ cover_class }}
 
         {% if not book.cover %}