/books/covers/ should be a page, maybe?

[agude]

https://alexgude.com/books/covers/ is currently a 404; should it... display covers or something?

[agude]

Same question for: https://alexgude.com/books/authors

[agude]

Same question for: https://alexgude.com/books/series/

[agude]

The series and authors pages are now redirected to the by-series and by-author pages. Still thinking about `covers.