docs: update the README with an easy way to run the MFE with Tutor (on your host)

[bradenmacdonald]

Description

When I became maintainer of the Learning MFE, I updated its README to explain how to easily run it in dev mode on your host, along with Tutor.

This PR makes the same improvements to the README of the Authoring MFE.

[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.01%. Comparing base (434fea3) to head (2360fb0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1364   +/-   ##
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  Coverage   93.01%   93.01%           
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  Files        1035     1035           
  Lines       19630    19630           
  Branches     4161     4161           
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  Hits        18258    18258           
- Misses       1307     1310    +3     
+ Partials       65       62    -3     

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[bradenmacdonald]

@KristinAoki (not urgent) Would 2U be OK with this change to the README? Currently it recommends devstack, but outside of 2U devstack is deprecated. And this way of running it on the host instead of inside a container is much nicer for development.

[KristinAoki]

@KristinAoki (not urgent) Would 2U be OK with this change to the README? Currently it recommends devstack, but outside of 2U devstack is deprecated. And this way of running it on the host instead of inside a container is much nicer for development.

Yes! If we need the devstack instructions we have that internally or we can look at the file history.