More keyboard shortcuts

[Hanziness]

Discussed in #252

^{Originally posted by dmlls August 7, 2022}
First of all, thanks for this great and good-looking app!

I've been using it for a while and it always feels somehow cumbersome to me that when a section is finished I can pause it with the space bar, but then I have to click on the arrow to move to the next section.

What do you think about adding a shortcut for moving to the next section? Perhaps Enter would do?