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>

dns.yml

@@ -55,8 +55,6 @@
             ip: "{{ network.netcup_ip }}"
           - name: id
             ip: "{{ network.netcup_ip }}"
-          - name: kavita
-            ip: "{{ network.netcup_ip }}"
       - name: nerder.land
         dns_records:
           - name: "forms"