[DOCS] Readme updated according OEP-55

[johnvente]

The README of the MFE's need to be updated because the frontend app template has been updated

Issue related: openedx/wg-frontend#169

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[justinhynes]

Thanks for submitting this update! Just needs a few tiny fixes to some links for this to be good to go.

[johnvente]

Thanks for submitting this update! Just needs a few tiny fixes to some links for this to be good to go.

Thanks for the review! I have done the fixes 😄

[justinhynes]

Thanks for the fixing the things I pointed out! Looks good to me. I'll go ahead and merge this shortly!

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