Bezkont Klavesnice Zbrojovka hardware-based keyboard with Jian-based layout

Originally from https://nest.pijul.com/sunflower/jianovka

Copy firmware folder into qmk_firmware/keyboards/jianovka, run make jianovka:default.

• https://nest.pijul.com/sunflower/jianovka
• https://www.flickr.com/photos/triplehaata/albums/72157661916775494/
• https://www.bucek.name/pdf/mh3sd2,mh3ss2.pdf