Configurable keybindings for focus

[manfredlift]

pi-btw/extensions/btw.ts

Line 35 in 4f85810

const BTW_FOCUS_SHORTCUTS = [Key.alt("/"), Key.ctrlAlt("w")] as const;

Would you consider making these configurable or adding a third one (like Cmd+/)? Unfortunately both of the keybindings conflict with my tiling window manager. :(