WT-1460 De Enterprise newsletter update

[wen-2018]

One-line summary

This PR updates the enterprise newsletter content for DE.

Significant changes and points to review

Content in DE

Issue / Bugzilla link

https://mozilla-hub.atlassian.net/browse/WT-1460

Testing

http://localhost:8000/en-US/newsletter/enterprise/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.61%. Comparing base (5a152ec) to head (93b68e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1617   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files         156      156           
  Lines       10816    10816           
=======================================
  Hits         9476     9476           
  Misses       1340     1340           

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