Arrange books by tag

### Have you checked that your feature request isn't already filed?

- [x] I read through [FAQ](https://github.com/alshedivat/al-folio/blob/main/FAQ.md) and searched through the [past issues](https://github.com/alshedivat/al-folio/issues), none of which addressed my feature request.
- [x] Yes, I have checked that this feature request isn't already filed.

### Description & Motivation

Hi, I would like to arrange the books in the bookshelf by tag instead of date. Specifically, I want to list work books and books I read for entertainment and have the lists separate. I do not want a further subdivision by date, but if they are sorted by date (without date headers), that's even better! Can you explain how to make this happen? Thanks!

### Pitch

_No response_

### Alternatives

_No response_

### Additional context

_No response_