css: add some styles for print
css: add some styles for print

Mostly just hiding the header and sidebar.

yagebu/fava,beancount/fava,yagebu/fava,beancount/fava,aumayr/beancount-web,yagebu/fava,beancount/fava,yagebu/fava,aumayr/beancount-web,aumayr/beancount-web,beancount/fava,aumayr/beancount-web,yagebu/fava,beancount/fava