First pass at improving local development tutorial (#1473)
First pass at improving local development tutorial (#1473)

* First pass at improving local development tutorial. This fixes #1434.
Co-authored-by: Michael Brooks <8e3f0545423e5deb1992836473abd2c5cfd2d537@slack-corp.com>
Co-authored-by: Sarah Jiang <42262577bc54a457589d7e766bfda50b86464ec2@slack-corp.com>
slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackapi/node-slack-sdk