refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 11 deletions

diff --git a/dotfiles/system/.local/bin/cron/README.md b/dotfiles/system/.local/bin/cron/README.md
deleted file mode 100644
index fa0c354..0000000
--- a/dotfiles/system/.local/bin/cron/README.md
+++ /dev/null
@@ -1,11 +0,0 @@
-# Important Note
-
-These cronjobs have components that require information about your current display to display notifications correctly.
-
-When you add them as cronjobs, I recommend you precede the command with commands as those below:
-
-```
-export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u $USER)/bus; export DISPLAY=:0; . $HOME/.zprofile;  then_command_goes_here
-```
-
-This ensures that notifications will display, xdotool commands will function and environmental variables will work as well.