Added support for nested lists to email newsletter template

[sanne-san]

Refs https://github.com/TryGhost/Team/issues/1919

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.05 🎉

Comparison is base (a85d455) 71.62% compared to head (cac7a9b) 71.67%.

❗ Current head cac7a9b differs from pull request most recent head 94670b7. Consider uploading reports for the commit 94670b7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17161      +/-   ##
==========================================
+ Coverage   71.62%   71.67%   +0.05%     
==========================================
  Files        1833     1833              
  Lines      116265   116265              
  Branches    17255    17281      +26     
==========================================
+ Hits        83270    83337      +67     
+ Misses      31874    31803      -71     
- Partials     1121     1125       +4     

Flag	Coverage Δ
e2e-tests	66.48% <ø> (+<0.01%)	⬆️
unit-tests	63.50% <ø> (+0.08%)	⬆️

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see 16 files with indirect coverage changes

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