refactor: move original quest content into each quest's zh-TW folder

quests/copy/zh-TW/answer.sh

@@ -0,0 +1,13 @@
+echo start
+ls
+cat hello.txt
+cat world.txt
+echo next
+cp hello.txt hello2.txt
+cat hello2.txt
+cp world.txt world2.txt
+cat world2.txt
+cp -r notes notes2
+ls notes2
+cp hello.txt world.txt
+cat world.txt