Initial import: chezmoi source for CachyOS + Umbriel + Noctalia

Imported from prdlk/dotfiles master (efdd827). Drops the niri, Hyprland/Omarchy,
macOS, and Blume docs-site layers; docs/ is plain Markdown.

dot_config/bash/functions/c.bash

@@ -0,0 +1,8 @@
+# c: clear with no args, cd with one.
+c() {
+    if [ -z "${1-}" ]; then
+        clear
+    else
+        cd "$1"
+    fi
+}