performance fixes

fix(deps): update deps

Update README.md

chore(build): Disable yarn workspaces again until nohoist is implemented

We have to wait until yarnpkg/yarn#4979 is merged, as electron-builder can't
resolve the dependencies otherwise.

fix(electron): postcss config

fix(deps): make graphql-config a normal dep

chore(version): update graphql-playground-react version

fix(deps): Update graphql-playground-middleware-express

[email protected]

Update package.json