Remove npm scripts depend on OS

Author: F88

package.json

@@ -13,15 +13,9 @@
     "lintx": "eslint --ext .js,.vue .",
     "clean": "rimraf .nuxt dist",
     "install:functions": "yarn install --cwd dist/server",
-    "install:functions:win": "cd dist\\server && npm install && cd ..\\..\\",
-    "install:functions:nix": "pushd dist/server && npm install && popd",
     "copy": "yarn copy:client && yarn copy:server",
     "copy:server": "cpx -Cv \"functions/**\" dist/server && cpx -v \".nuxt/**\" dist/server/",
-    "copy:server:win": "xcopy /e /c /h /i /y functions dist\\server && xcopy /e /c /h /i /y .nuxt dist\\server\\.nuxt",
-    "copy:server:nix": "cp -rTv functions/ dist/server && cp -rv .nuxt/ dist/server/",
     "copy:client": "cpx -Cv \"src/static/**\" dist/client/ && cpx -Cv \".nuxt/dist/**\" dist/client/assets/",
-    "copy:client:win": "xcopy /e /c /h /i /y src\\static dist\\client && xcopy /e /c /h /i /y .nuxt\\dist dist\\client\\assets",
-    "copy:client:nix": "cp -rTv src/static dist/client && cp -rTv .nuxt/dist/ dist/client/assets",
     "firebase-emulator": "yarn clean && yarn lint && yarn build && yarn copy && yarn install:functions && firebase emulators:start"
   },
   "lint-staged": {