* Render app only after ENV variables are fetched from server
* Specify node and npm versions in root package.json
* Specify engine npm version: 7.20.0
* setup sentry for server
* setup sentry for client
* update docs for sentry dns
* explicitly specify apm vendor
* add module for sentry
* revise directory struct and make sentry debuggable
* setup csp and trace headers for sentry
* whitelist csp for all sentry urls
* change senrty error sample rate to 50%
* make sentry send all errors from backend