Move books. from Calibre-Web to Kavita

Kavita now serves books.thesatelliteoflove.com with Pocket ID login
(password login is off), and the temporary kavita. subdomain is gone.
Calibre-Web's stack is removed; its calibre_books and calibre_config
volumes stay on docker-01 as a fallback for now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/docker/README.md

@@ -32,7 +32,7 @@ Deploys and manages a comprehensive self-hosted infrastructure with 24 container
 
 ### Media (`media/`)
 - **Audiobookshelf** - Audiobook and podcast server
-- **Calibre** - E-book management and conversion
+- **Kavita** - E-book server (Pocket ID login)
 - **Ghost** - Modern blogging platform
 - **Pinchflat** - YouTube video archiving
 - **Pinry** - Pinterest-like image board
@@ -183,7 +183,7 @@ The role uses a centralized variable hierarchy in `group_vars/all/`:
 Services expect to be accessible via subdomains of configured domains:
 - `auth.thesatelliteoflove.com` - Authentik
 - `git.thesatelliteoflove.com` - Gitea
-- `books.thesatelliteoflove.com` - Calibre
+- `books.thesatelliteoflove.com` - Kavita
 - `tasks.thesatelliteoflove.com` - MMDL
 - (and many more...)