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

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6519c3d) 82.26% compared to head (83974b1) 82.49%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
+ Coverage   82.26%   82.49%   +0.23%     
==========================================
  Files          38       38              
  Lines         716      714       -2     
  Branches      233      232       -1     
==========================================
  Hits          589      589              
+ Misses        123      121       -2     
  Partials        4        4              

see 3 files with indirect coverage changes

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