Initial import: chezmoi source for Omarchy (Hyprland)

Imported from prdlk/dotfiles master (efdd827), which supersedes the omarchy
branch (3031416). Drops the Umbriel, Noctalia, niri, CachyOS, macOS, and Blume
docs-site layers; docs/ is plain Markdown.

dot_config/xdg-terminals.list

@@ -0,0 +1,4 @@
+# Default terminal for xdg-terminal-exec (omarchy-launch-terminal,
+# GLib's Terminal=true launches): first entry wins.
+com.mitchellh.ghostty.desktop
+kitty.desktop