Wagtailset

Fixed

- fix url in Link widget

Added

- add link icon to HeaderAnchorDecorator
- add CopyAnchorButton to AnchorIdentifier

Fixed

- fix console error when promt cancelled

Added

- add anchored internal links

Fixed

- fix CopyAnchorButton: class -> className
- extend HeaderAnchorDecorator from TooltipEntity
- slugify custom header anchor
- make all buttons in Tooltip small

Added

- init repo
- add wagtailset.draftail_anchors