v0.4.0

This release mainly includes minor improvements & fixes:

Improving:

• Gravatar is now optional, fallback may be provided via config/lingonberry.php, 8263967
• Updated docs
• License & copyright notice for raw-kirbytext snippet, eb0f8c3

Fixing:

• Querying variable error (screwing pagination), 91ec3d3
• $params filter in templates/home.php, 0418a9d
• Misplaced image attributes, 04d008e
• Retina gallery icon not showing, 2775a12
• Better accessibility for alt attributes, 3ea42de (credit goes to @texnixe)

Note:
Future enhancements of kirby-lingonberry might require the project to detach from its roots a little more. @texnixe provided valuable suggestions on how to do so.