we need options --flat in packages.json/scripts/postinstall to make icon-fonts copy correctly
from
"postinstall": "cpy ./node_modules/framework7-icons/fonts/*.* ./src/fonts/ && cpy ./node_modules/material-icons/iconfont/*.* ./src/fonts/"
to
"postinstall": "cpy ./node_modules/framework7-icons/fonts/*.* ./src/fonts/ --flat && cpy ./node_modules/material-icons/iconfont/*.* ./src/fonts/ --flat"