Add desktop environment configs and provisioning scripts for debian

- Add qutebrowser configs
- Add xfce4-panel config
- Add provision_debian script
- Add upgrade_debian script
- Refactor sync script to separate terminal and desktop env configs

upgrade_debian

@@ -0,0 +1,35 @@
+#!/usr/bin/env fish
+
+function main
+    log 'Upgrading debian to unstable.' head
+
+    echo '
+deb http://deb.debian.org/debian unstable main contrib non-free
+deb-src http://deb.debian.org/debian unstable main contrib non-free' | sudo tee /etc/apt/sources.list
+
+    sudo apt-get update > /dev/null 2>&1
+    sudo apt-get dist-upgrade --yes
+
+    log 'Done upgrading debian to unstable and rebooting.' tail
+
+    sudo reboot
+end
+
+function log -a message level
+    if test "$level" = head
+        echo "
+###########################################################################################
+#
+#--> $message"
+    else if test "$level" = tail
+        echo "#
+#--> $message
+#
+###########################################################################################
+"
+    else
+        echo -e "#\n#--> $message"
+    end
+end
+
+main