Do not send customer invitation email

[dominik-zeglen]

I want to merge this change because dashboard has no information about storefront url, and until it has, we cannot send these mails.

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #211 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #211   +/-   ##
======================================
  Coverage    73.5%   73.5%           
======================================
  Files         567     567           
  Lines        5919    5919           
  Branches     1007    1007           
======================================
  Hits         4351    4351           
  Misses       1394    1394           
  Partials      174     174

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