Fix CI build error. Was caused by changed locale path

See merge request decker/decker!10

Removed COPY statement from Dockerfile, added pandoc-citeproc-flag embed_data_files to stack.yaml to ensure availability of locales.

1. Move stylesheets from deck.html to decker.scss (solves issue #38); 2. Give…

See merge request decker/decker!9

around the render canvas

1. Move stylesheets from deck.html to decker.scss (solves issue #38); 2. Give decker.css highest priority of all stylesheets in deck.html (solves issue #37); 3. Modify print layout;

Update decker.scss: columns, print, and dense layouts

See merge request decker/decker!8

Resolve "Wrong output of decker check with sassc missing"

Closes #35

See merge request decker/decker!7