- Have an explicit contextual class on `cover-container`.
- Use more flexible, consistent and searchable variable name for passing classes to covers.
- Consistently use `'…'` with django variables.
- Give the option to not hide covers to screen readers.
- consitently give a title to the cover container if `alt_text` exists.
- [lists] Remove `.content` which is applying too extensive default styles.
- Avoid specifying context-dependent values in CSS for components. Those values can be defined by the context calling the component.
- Use `<figure>` with optional caption.
- Reduce redundant markup.
- Allow more variables to be passed to the book-cover (image path and class for the container).
- Hide the book cover to screen readers.
