feature: `<ESC>` to close the floating window

[CAESIUS-TIM]

I use vimium-c for mouse-free browsing. While I can select text with vimium-c and use the <ctrl><ctrl> shortcut for translation, I'm unable to find a keyboard shortcut to close the floating window.

Thanks!

[CAESIUS-TIM]

A temporary solution is just to use vimium-c to click somewhere. But hover and focus are useless, so I must click something. If there are only links, a new tab is created 😞.