Add stage secret and try oAuth login settings

quests/helloworld/answer.json

@@ -7,6 +7,15 @@
   "story2": "{enter}{enter}{enter}{enter}{enter}",
   "start2": "你找到了一個被遺忘的卷軸，上面寫著解除封印的咒語。",
   "end2": "使用 `Tab` 鍵來取得指令提示。",
+  "stage_hidden1": "mkdir jail{enter}",
+  "stage_hidden2": "ls{enter}",
+  "stage_hidden3": "cd jail{enter}",
+  "stage_hidden_story1": "你進入了一個牢房，牢房裡有一個門，門上有一個鎖。",
+  "stage_hidden_story2": "轉身發現，自己被關在了牢房裡。",
+  "stage_hidden4": "{enter}{enter}{enter}",
+  "stage_hidden5": "cd ..{enter}",
+  "stage_hidden6": "rmdir jail{enter}",
+  "stage_hidden7": "ls{enter}",
   "stage3": "cat forgotten_scroll.txt{enter}",
   "story3": "{enter}{enter}",
   "scrollcontent": "Unix, rise and guide me!",