remove duplicate caving system entry

systems.tex

@@ -228,9 +228,6 @@ A bright torch adds a +3 Bonus.
 A tie means the character comes to a sudden halt, without Damage.
 Failure means $1D6$ Damage, plus the character's Speed (running faster means more Damage).
 
-\subsubsection{\Glsfmttext{caving}}
-\glsentrydesc{caving}
-
 \subsection{News \& Information}
 
 \makeRule{find_rumours}{Finding rumours}{Charisma}{Empathy}{3}