Rename A:BF.css to A-BF.css

To fix "difficulties" when using this repository on a windows based OS (doesn't allow colons in filenames)
Rename A:BF.html to A-BF.html

To fix "difficulties" when using this repository on a windows based OS (doesn't allow colons in filenames)
Update sheet.json

To fix "difficulties" when using this repository on a windows based OS (doesn't allow colons in filenames)