Use npmjs.org instead of yarnpkg.com
Created by: nicksnyder
This is an attempt to fix the recurring flakiness that we have been seeing in our builds by switching to npmjs.org
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error An unexpected error occurred: "https://registry.yarnpkg.com/mdi-react/-/mdi-react-4.0.0.tgz: ESOCKETTIMEDOUT".
info If you think this is a bug, please open a bug report with the information provided in "/buildkite/builds/buildkite-agent-797f4d46cb-slr2l-1/sourcegraph/.golang/sourcegraph/src/github.com/sourcegraph/sourcegraph/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
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info There appears to be trouble with your network connection. Retrying...see https://github.com/yarnpkg/yarn/issues/2508#issuecomment-283655600