Remove building docs during checkout-monorepo step on CircleCI (ether…

…eum#982)

## Description

Build docs was broken on `celo-monorepo` and making CircleCI fail:
https://circleci.com/gh/celo-org/celo-blockchain/31556?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

AFAIK, we don't need really need to build docs for the e2e tests to pass, so removing it here.

Update: celo-monorepo docs has been fixed, but I still think we should skip building docs in this context.

.circleci/config.yml

@@ -141,7 +141,6 @@ jobs:
             # separate build to avoid ENOMEM in CI :(
             yarn build --scope @celo/utils
             yarn build --scope @celo/protocol
-            yarn build --scope docs
             yarn build --ignore @celo/protocol --ignore docs --ignore @celo/web --ignore @celo/mobile --ignore @celo/react-components
       - run:
           name: Setup Go language