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>

group_vars/docker/services.yml

@@ -4,7 +4,7 @@
 service_categories:
   infrastructure: ["caddy", "authentik", "dockge"]
   development: ["gitea", "bytestash"]
-  media: ["audiobookshelf", "calibre", "kavita", "dir2opds", "hoarder", "kosync", "manyfold"]
+  media: ["audiobookshelf", "kavita", "dir2opds", "hoarder", "kosync", "manyfold"]
   productivity: ["paperlessngx", "baikal", "syncthing", "heyform", "dawarich", "obsidian-livesync", "gokapi"]
   communication: ["gotosocial", "listmonk"]
   monitoring: ["changedetection", "appriseapi", "gotify", "cronmaster"]