add config.window_width/height (in addition to initial_rows/cols)

[rahil627]

i just find the words intitial_rows/cols archaic... like ba$h and perl archaic. I think most people think of config.window_width/height, and that's likely what they search, and hopefully they end up finding it in the docs.. But maybe it wouldn't hurt just having both..?

it's very possible there's some technical thing here that i don't know tho.. like it's rows/cols of a terminal via ncurses, as opposed to the window drawn by sdl?? but to me, a feeble abstracted mind, i just expect window_width/height. or even, straight up config.width/height! Heck, i'd be down for all three! 😄

very very small nitpickings while i was config'ing.

as always <3 everything about wezzzywezterm