Buttons are ready

Added

• There is now neutral colors exposed (N75 to N500).
• New entrypoints to optimize bunles size (tree shaking):
  • @ferpection/uikit/colors to load only colors
  • @ferpection/uikit/components to load only components
• Creation of a CHANGELOG file to easily store change logs before tagging.
• It is possible to change Buttons color using the color attribute.
• New PositiveButton and NegativeButton to express sentiment about actions.
• Buttons automatically calculates hover color based on main color.

Changed

• Colors' names has been updated.
• Basic default button's color is C200.
• IconButton is removed in favor of Button

Fixed

• Internal: JSX is also formated using prettier.
• Buttons now follow Ferpection's website design rules (borders, font, animations, etc).