removed arity

Removed arity as it has been deprecated in favor of Function.prototype.length
Update README.md
Update README.md
add css question.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
update doc from d5df1268d

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
fixed typo

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
fixed typo

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #152 from jsloyer/master

removed arity
Merge pull request #154 from rishabhjain2795/master

Added two new questions. (CSS)
Merge pull request #156 from appleboy/patch

update Chinese-Traditional language.
Remove outdated content, update contributors.
Moving translations to their own directory
Delete .gitignore