refactor: updated README file to reflect template changes

[Mashal-m]

Anyone merging to this repository is expected to promptly release and monitor their changes; if you are not able to do this DO NOT MERGE, please coordinate with someone who can to ensure that the changes are released.

Description

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

Issue related: openedx/wg-frontend#169

Useful information to include:

• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author", "Developer", and "Operator".
• Include screenshots for changes to the UI (ideally, both "before" and "after" screenshots, if applicable).
• Provide links to the description of corresponding configuration changes. Remember to correctly annotate these changes.
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Supporting information

Testing instructions

Other information

Checklist

• Consider PCI compliance impact and whether this PR changes how credit card information is handled.
• Intend to release and monitor this PR promptly after merge.