Remove Waybar from autostart (now handles with systemd)

This is also removes the ability to substitute system-wide Waybar config
with our own, because Waybar's systemd unit file doesn't provide
such functional. Default Waybar config is now placed in ~/.config/waybar/

etc/skel/.config/waybar/config.jsonc.example

@@ -1,5 +0,0 @@
-{
-    "include": [
-        "/etc/xdg/xdg-ubuntusway/waybar/config.jsonc"
-    ]
-}

etc/skel/.config/waybar/style.css.example

@@ -1 +0,0 @@
-@import "/etc/xdg/xdg-ubuntusway/waybar/style.css";

etc/sway/config.d/20-waybar.conf

@@ -1,9 +0,0 @@
-#
-# Status Bar:
-#
-# Read `man 5 sway-bar` for more information about this section.
-bar {
-    id default
-    swaybar_command /usr/share/sway/scripts/waybar.sh
-    position top
-}

usr/share/sway/scripts/waybar.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-# wrapper script for waybar with args, see https://github.com/swaywm/sway/issues/5724
-
-USER_CONFIG_PATH=$HOME/.config/waybar/config.jsonc
-USER_STYLE_PATH=$HOME/.config/waybar/style.css
-
-if [ -f "$USER_CONFIG_PATH" ]; then
-  USER_CONFIG=$USER_CONFIG_PATH
-fi
-
-if [ -f "$USER_STYLE_PATH" ]; then
-  USER_STYLE=$USER_STYLE_PATH
-fi
-
-waybar -c "${USER_CONFIG:-"/etc/xdg/xdg-tileos/waybar/config.jsonc"}" -s "${USER_STYLE:-"/etc/xdg/xdg-tileos/waybar/style.css"}" &