[fish] add push and pull books functions

fish/.config/fish/functions/pullbooks.fish

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+function pullbooks
+	rsync --delete -rvzhP root@atlas.local:/tank/books/ ~/.calibre/
+end

fish/.config/fish/functions/pushbooks.fish

@@ -0,0 +1,3 @@
+function pushbooks
+	rsync --delete -rvzhP ~/.calibre/ root@atlas.local:/tank/books
+end