makefile won't build for all targets of zip recipe

[skibz]

this line of the makefile used to be

hnlists-firefox.zip hnlists-chrome: *.js *.png

and i had this faulty assumption that the recipe would be run for every target, but it always results in only the first target being built.

simplest solution to fixing this is to make separate recipes for each browser, and then a phony "all" target or whatever that gets executed with make all.

what i really want, though, is to have one recipe for all browser targets with which a single make command may be issued.

but ultimately, as soon as firefox begins to supports manifest v3, all of this will cease to be an issue as that's actually the only reason there are different zips being built per browser to begin with...