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

How Has This Been Tested?

Please describe in detail how you tested your changes.

Screenshots/sandbox (optional):

Include a link to the sandbox for design changes or screenshot for before and after. Remove this section if its not applicable.

Before	After

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/vanguards to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e10d6b6) 86.98% compared to head (e0c0859) 86.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1089   +/-   ##
=======================================
  Coverage   86.98%   86.98%           
=======================================
  Files         124      124           
  Lines        2266     2266           
  Branches      624      624           
=======================================
  Hits         1971     1971           
  Misses        286      286           
  Partials        9        9           

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[mubbsharanwar]

Please address these suggestions before merging.