fix: only gitignore real puzzle inputs

.gitignore

@@ -17,8 +17,5 @@ target/
 # Advent of Code
 # @see https://old.reddit.com/r/adventofcode/comments/k99rod/sharing_input_data_were_we_requested_not_to/gf2ukkf/?context=3
 
-data
+data/inputs/*
-
 !data/inputs/.keep
-!data/examples/.keep
-!data/puzzles/.keep