refactor: updated README file to reflect template changes

[Mashal-m]

Description

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

Issue related: openedx/wg-frontend#169

[coveralls]

Pull Request Test Coverage Report for Build 6654699919

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.335%

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Totals
Change from base Build 6592848292:	0.0%
Covered Lines:	168
Relevant Lines:	306

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ade40a0) 58.08% compared to head (9e775d1) 58.08%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   58.08%   58.08%           
=======================================
  Files          26       26           
  Lines         396      396           
  Branches       66       66           
=======================================
  Hits          230      230           
  Misses        150      150           
  Partials       16       16           

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