install: better install + use data and state

Don't complete remove repos, use git pull instead
Use XDG_DATA_HOME and XDG_STATE_HOME

install/gtk.fish

@@ -4,24 +4,12 @@
 
 install-deps git adw-gtk-theme
 
-set -l gtk $CONFIG/gtk
-set -l systemd $CONFIG/../systemd/user
+set -l dist $C_DATA/gtk
 
-confirm-overwrite $gtk
-git clone 'https://github.com/caelestia-dots/gtk.git' $gtk
+# Update/Clone repo
+update-repo gtk $dist
 
 # Install systemd service
-if test -d $systemd
-    log 'Installing systemd service...'
-
-    echo "[Service]
-Type=oneshot
-ExecStart=$gtk/monitor/update.fish" > $systemd/gtk-monitor-scheme.service
-    cp $gtk/monitor/gtk-monitor-scheme.path $systemd/gtk-monitor-scheme.path
-
-    systemctl --user daemon-reload
-    systemctl --user enable --now gtk-monitor-scheme.path
-    systemctl --user start gtk-monitor-scheme.service
-end
+setup-systemd-monitor gtk $dist
 
 log 'Done.'