refactor: updated README file to reflect template changes

[Mashal-m]

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Description

The README of the MFEs needs to be updated because the frontend app template has been updated.

Issue related: openedx/wg-frontend#169

Supporting information

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Testing instructions

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Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, OpenEdx vs. edx.org differences, development vs. production environment differences, security, or accessibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b661de7) 61.53% compared to head (e94a155) 61.53%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #347   +/-   ##
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  Coverage   61.53%   61.53%           
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  Files          34       34           
  Lines         325      325           
  Branches       69       69           
=======================================
  Hits          200      200           
  Misses        118      118           
  Partials        7        7           

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