Added

• Using the new VIKUNJA_BACKGROUND_IMG_URL and LINKWARDEN_BACKGROUND_IMG_URL environment variables, it's now possible to set custom background images for the tasks/bookmarks cards of the Vikunja and Linkwarden iframes.
• The background_position, background_size, and background_filter query arguments added to the Vikunja and Linkwarden iframes can change the custom background images' CSS properties.

Full Changelog: v1.1.1...v1.2.0