Update project urls and references into using project app name.

[sipa-echo-zaoa]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.61%. Comparing base (d637505) to head (30f48e9).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
newsletter/models.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   87.58%   87.61%   +0.02%     
==========================================
  Files          17       17              
  Lines        1394     1397       +3     
  Branches      150      150              
==========================================
+ Hits         1221     1224       +3     
  Misses        128      128              
  Partials       45       45              

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[newearthmartin]

Hi @sipa-echo-zaoa thanks for your contribution! I'm wary about merging this PR now as it is a breaking change and it can do more damage than good. It would need to be merged in the next major release such as 2.0