Make yarn install work with Yarn v2

[danielattilasimon]

@DanWizard reported having trouble installing dependencies with Yarn v1 on Windows. Yarn v2 can install everything fine, but yarn start-dev-frontend has trouble loading some modules.

Failed to load config "react-app" to extend from.
Referenced from: C:\Users\***\liquity\packages\dev-frontend\package.json

After deleting eslintConfig from package.json:

C:/Users/***/liquity/.yarn/$$virtual/@emotion-react-virtual-cb0b3bb86b/0/cache/@emotion-react-npm-11.1.4-e22adbc3be-a75d76ba0b.zip/node_modules/@emotion/react/dist/emotion-element-4fbd89c5.browser.esm.js

Module not found: @emotion/react tried to access react (a peer dependency) but it isn't provided by its ancestors; this makes the require call ambiguous and unsound.

It seems whoever depends on @emotion/react is not providing its react peer-dependency. Yarn v2 is stricter about dependency loading, and won't load modules that are installed (indirectly) but not declared in package.json.

Yarnrc can be used to work around such bugs until they are fixed upstream: https://yarnpkg.com/configuration/yarnrc#packageExtensions.