sl0p(pane-finder): document a single-chord binding

Reaching the finder through a mode dance (leader, then session mode, then a
letter) is too many keys for something used constantly. Documents Ctrl-; as a
one-chord binding, and why: ';' has no control-code meaning, readline does not
bind it, and vim binds only bare ';' -- while plain ';' keeps typing normally.

Also records the tradeoff. Ctrl-; needs the kitty keyboard protocol to be
distinguishable from a plain ';', so it silently never fires on a terminal
without it. The combos that work anywhere are real control codes and are all
taken: Ctrl-\\ is SIGQUIT, Ctrl-] is vim's tag jump, Ctrl-_ is readline undo.

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