Added

• Initial support for DuckDuckGo.
• Korean translation (thanks to @mznu ).

Changed

• Adjust UI.
  • The Show/Hide/Block/Unblock buttons are focusable by keyboard now.

Fixed

• (For Startpage.com users) did not work on https://startpage.com/*.
  • Please press the Enable button on the options page again.

Internal

• CI by Github Actions.
• Hidden options:
  • enablePathDepth (type: boolean, default: false) by @mzyy94 (See #26)
  • hideControl (type: boolean, default: false)