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/discord.fish

@@ -10,30 +10,17 @@ end
 install-deps git
 install-optional-deps 'arrpc (rich presence)'
 
-set -l systemd $CONFIG/../systemd/user
-set -l client $CONFIG/../$argv[1]
-set -l discord $CONFIG/discord
+set -l client $CONFIG/$argv[1]
+set -l dist $C_DATA/discord
 
-# Clone repo
-confirm-overwrite $discord
-git clone https://github.com/caelestia-dots/discord.git $discord
+# Update/Clone repo
+update-repo discord $dist
 
 # Install systemd service
-if test -d $systemd
-    log 'Installing systemd service...'
-
-    echo "[Service]
-Type=oneshot
-ExecStart=$discord/monitor/update.fish" > $systemd/discord-monitor-scheme.service
-    cp $discord/monitor/discord-monitor-scheme.path $systemd/discord-monitor-scheme.path
-
-    systemctl --user daemon-reload
-    systemctl --user enable --now discord-monitor-scheme.path
-    systemctl --user start discord-monitor-scheme.service
-end
+setup-systemd-monitor discord $dist
 
 # Link themes to client config
 confirm-overwrite $client/themes
-ln -s $discord/themes $client/themes
+ln -s $dist/themes $client/themes
 
 log 'Done.'