On-boarding: Simplify running browser tests locally

[michaeldiamant]

Problem

There's been at least a few cases of folks facing more friction than is desirable to get browser tests running locally. The story asks to either (or both):

• Extend README docs (https://github.com/algorand/js-algorand-sdk/#browsers) to make the process clearer. We can vet the process by having someone unfamiliar with the process run through the new steps.
• Identify + implement quick wins to streamline the process. Rather than blindly accepting the as-is process, the story asks us to also look for improvement opportunities.

Solution

Dependencies

Urgency