Sesh close command

[joshmedeski]

What would you like sesh to do?

sesh close to improve the functionality of tmux

• When closing the last window of a session, we want to close and connect to the last attached session (tmux currently chooses something apparently random?)
• Alternative solution: Look into contributing to tmux source code and fixing this issue (see Feature request: switch to next or previous session after current session is closed tmux/tmux#3343) (also see this: https://github.com/tmux/tmux/blob/37771a5a8de65d7ddfef76d26810fe521ead0a77/server-fn.c?plain=1#L432)