Windows frontend local launch

[m1ker1n]

Hi, I found that yarn postinstall doesn't works properly on Windows. Well, I saw that devs aren't using Windows, but I use.

(cd viz-lib && yarn --frozen-lockfile && yarn build:babel) && yarn link --link-folder ./.yarn @redash/viz works differently on Linux and Windows.
Idea of the script is to install & build package in directory viz-lib and then link this package. But on Windows there is no such things as subshells so everything is executed as there is no the parenthesis. So the script tries to link package to folder ./viz-lib/.yarn instead of ./.yarn which is wrong.

It would be nice if you rewrite it as
cd viz-lib && yarn --frozen-lockfile && yarn build:babel && cd .. && yarn link --link-folder ./.yarn @redash/viz

I tested on my pure Windows and on WSL2 with Ubuntu, and it works fine, so I hope you won't see the difference and I get what I want :)