dotfiles: move .config/* to root

This seems to make more sense. Almost all files were within .config
anyway.

Signed-off-by: Joe Groocock <me@frebib.net>

systemd/user/polybar@.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Polybar
+Requires=graphical-session.target
+After=graphical-session.target pulseaudio.socket i3.service
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/polybar --reload --log=warning %i
+ExecReload=/usr/bin/polybar-msg cmd restart -p $MAINPID
+Restart=always
+
+[Install]
+WantedBy=desktop.target