chore: tell Vercel not to build the gh-pages branch
chore: tell Vercel not to build the gh-pages branch

Looks like Vercel "Ignored Build Step" doesn't support piping (yet?),
so we're forced to use an external script ("bash .vercel/ignore-gh-pages.sh").

italia/developers.italia.it,italia/developers.italia.it,italia/developers.italia.it,italia/developers.italia.it