Update Gameplay, Splitted in 2 Modes

• The game is now responsive, meaning it works on smartphones as well as desktop computers
• The timer for a round has been increased from 12 to 15
• Improved the random pick of questions to avoid repetition
• The game now also ends when the player answered all the questions
• There is now two modes:
  • normal: A right answer rise the timer to its maximum
  • normal: A wrong answer doesn't affect the timer
  • hardcore: A right answer rise the timer of 1 to 3 seconds
  • hardcore: A wrong answer drop the timer of 1 to 3 seconds
  • hardcore: The amount of the "gap" depends on the complexity of the question
• The answers are now displayed randomly
• The structure of a question is now pretty simple and tested
• Fixed and improved some questions
• Fixed taunts to display "So, what's the result of..." only at the start of a new round
• Added a <noscript> tag
• Updated description to remove restriction to JavaScript "logical operators"
• Updated CONTRIBUTING.md according to the new changes