[i3] keybind to set to preferred floating size
[i3] keybind to set to preferred floating size

We can use the following to set the size by default, but I am gonna
stick to using an extra keybinding for now.

code: for_window [floating] resize set 900 500
 ref: https://www.reddit.com/r/i3wm/comments/l8tlxt/how_to_set_default_size_for_floating_windows/

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