Minor update release

List of changes

Added

• Added code of conduct
• Minor phpcs fixes
• Added changelog
• Added widget class
• Minor updates to setup script
• Added flex grid mixin

Changed

• phpcs.xml.dist ruleset name change
• Refactored scss assets
• Minor refactor in excerpt class

Removed

• Remove jQuery override so that the theme obey wordpress.org rules

Fixed

• Minor webpack config fix