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, 56 insertions, 0 deletions

diff --git a/dotfiles/common/.local/bin/update-backup-repositories b/dotfiles/common/.local/bin/update-backup-repositories
new file mode 100755
index 0000000..a91b438
--- /dev/null
+++ b/dotfiles/common/.local/bin/update-backup-repositories
@@ -0,0 +1,56 @@
+#!/bin/sh
+# Craig Jennings <c@cjennings.net>
+# updates or clones repositories for backup
+
+REPOS_HOME="/media/backup/repositories/"
+
+# Create REPOS_HOME dir if not exists
+if [ ! -d "$REPOS_HOME" ]; then
+    mkdir -p "$REPOS_HOME"
+fi
+
+# Make sure REPOS_HOME dir is writable
+if [ ! -w "$REPOS_HOME" ]; then
+    echo "Directory $REPOS_HOME is not writable."
+    exit 1
+fi
+
+# Make sure git is available
+if ! command -v git >/dev/null 2>&1; then
+    echo "Git command does not exist. Please install git."
+    exit 1
+fi
+
+cd "$REPOS_HOME"
+
+repos="
+git@cjennings.net:archsetup.git
+git@cjennings.net:dmenu.git
+git@cjennings.net:dotemacs.git
+git@cjennings.net:dotfiles.git
+git@cjennings.net:dwm.git
+git@cjennings.net:pinentry-dmenu.git
+git@cjennings.net:rsyncshot.git
+git@cjennings.net:st.git
+git@github.com:cjennings/emacs-wttrin.git
+https://github.com/d12frosted/elpa-mirror.git
+https://github.com/mirrors/emacs.git
+"
+
+for repo in $repos; do
+    dir=$(echo "$repo" | awk -F'[/:]' '{gsub(/.git/, "", $NF); print $NF}')
+    # Note on the above awk command:
+    # awk -F'[/:]':                        uses awk with a regex field delimiter that matches both : and /
+    #                                      which will work with both ssh and http style URLs.
+    # '{gsub(/.git/, "", $NF); print $NF}: This removes the ".git" postfixes from the last field ($NF)
+    #                                      which leaves only the repo name.
+
+    fullpath="$REPOS_HOME$dir"
+    if [ -d "$fullpath" ]; then
+        echo "Repository $dir exists at $fullpath, pulling..."
+        (cd "$fullpath" && git pull)
+    else
+        echo "Repository $dir doesn't exist at $fullpath, cloning..."
+        cd "$REPOS_HOME" && git clone --depth 1 "$repo" "$fullpath"
+    fi
+done