Cleanup code (#5)

* cleanup code

- reorder variables
- set show_errors to true by default
- remove old variable from config file
- update readme

mpv-youtube-queue.conf

@@ -1,6 +1,8 @@
 add_to_queue=ctrl+a
 download_current_video=ctrl+d
 download_selected_video=ctrl+D
+move_cursor_down=ctrl+j
+move_cursor_up=ctrl+k
 move_video=ctrl+m
 play_next_in_queue=ctrl+n
 open_video_in_browser=ctrl+o
@@ -9,15 +11,12 @@ play_previous_in_queue=ctrl+p
 print_current_video=ctrl+P
 print_queue=ctrl+q
 remove_from_queue=ctrl+x
-move_cursor_up=ctrl+UP
-move_cursor_down=ctrl+DOWN
 play_selected_video=ctrl+ENTER
 browser=firefox
 clipboard_command=xclip -o
 cursor_icon=➤
 display_limit=6
 download_directory=~/videos/YouTube
-download_format_str=%(uploader)s/%(title)s.%(ext)s
 download_quality=720p
 downloader=curl
 font_name=JetBrains Mono