Update README to be more helpful

[bradenmacdonald]

Description

The README is missing a lot of useful information about how to use Blockstore today. This PR brings it up to date.

[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald! I've created OSPR-4892 to keep track of it in JIRA.

As a core committer in this repo, you can merge this once the pull request is approved per the core committer reviewer requirements and according to the agreement with your edX Champion.

[bradenmacdonald]

@arbrandes FYI, I'm fixing the blockstore README. This should let you in turn simplify the setup/testing instructions in PRs like openedx-unsupported/frontend-app-library-authoring#4 .

BTW I notice that the frontend-app-library-authoring README is similarly in need of some love. I'm not sure if I'll get to it soon, but if you're writing up instructions for your PRs anyways you might as well put them into that README instead :)

[arbrandes]

@bradenmacdonald, this is great, thanks!

And yes, the MFE README needs a lot of love. I'll handle it when I issue my next PR. 👍

[natabene]

@bradenmacdonald Thank you for the contribution. Do you need edX' help with reviewing or merging this?

[symbolist]

@natabene I will be able to review this. 🙂

[bradenmacdonald]

@symbolist Would you be able to review this this sprint?

[symbolist]

• I tested the instructions for setting up the devstack.
• I ran the integration tests.
• I checked that the production config sample matches what we are using on one of the CI servers.

[openedx-webhooks]

@bradenmacdonald 🎉 Your pull request was merged!

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[openedx-webhooks]

@ormsbee, @kdmccormick: thought you might like to know that bradenmacdonald merged this pull request.