client: improve pdf generation * Move general template interpretation code from Waterlevel.vue to lib/mixins.js. This is the first step to remove code redundancy as this code is similiar in four other places.

#-*-makefile-*-
# Authors: Sascha Wilde <wilde@intevation.de>

.PHONY: all dependencies clean

all:	dependencies
	yarn build

dependencies:
	yarn install --check-files

clean:
	rm -rf ../web