"Show Kata Description" and "Show Kata Test Cases" sections can be to…

…ggled now and can be collapsed after once expanded.

Registered as issue #5.

README.md

@@ -36,6 +36,8 @@ WHAT FEATURES DOES IT PROVIDE?
  - Leaderboards: "Solved kata is default leaderboard (since "Overall"
    ranking does not measure anything useful). Also, leaderboards are
    automatically scrolled to show your score.
+ - "Show Kata Description" and "Show Kata Test Cases" sections can be toggled
+   now and can be collapsed after once expanded.
  - TODO: Filter discourse threads by resolution status (show only
    resolved/unresolved).
  - TODO: You can configure the script and enable/disable features.
@@ -78,4 +80,4 @@ CREDITS
  - TamperMonkey
  - StackOverflow
  - jQuery
- - notify.js
+ - notify.js