Word play buttons and the 'go to next round' button is not keyboard accessible

[dmundra]

Great game and video. I noticed the issue when playing on my laptop. I will try to submit a pull request when I can get to it. Because the word play buttons and the 'go to next round' button are divs they need to have extra attributes and JavaScript handlers to make it work for keyboards. An alternate would be to also make those buttons like the on screen keyboard.