Make example app compatible with a tutor dev environment

[wgu-taylor-payne]

Description:

The example app configuration has assumed a devstack dev environment, but devstack has been deprecated in favor of using tutor for dev environments. This PR changes things to work with tutor.

Fixes #811.

Merge checklist:

• Consider running your code modifications in the included example app within frontend-platform. This can be done by running npm start and opening http://localhost:8080.
• Consider testing your code modifications in another local micro-frontend using local aliases configured via the module.config.js file in frontend-build.
• Verify your commit title/body conforms to the conventional commits format (e.g., fix, feat) and is appropriate for your code change. Consider whether your code is a breaking change, and modify your commit accordingly.

Post merge:

• After the build finishes for the merged commit, verify the new release has been pushed to NPM.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.12%. Comparing base (31d2431) to head (d31a1c6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #819   +/-   ##
=======================================
  Coverage   87.12%   87.12%           
=======================================
  Files          48       48           
  Lines        1406     1406           
  Branches      297      300    +3     
=======================================
  Hits         1225     1225           
  Misses        168      168           
  Partials       13       13           

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[mphilbrick211]

Friendly ping on this @brian-smith-tcril @arbrandes

[wgu-taylor-payne]

I initially added specific steps to the README to overcome the CORS related errors, but I thought it might be better to keep it less prescriptive, so I changed that with my "fixup" commit.