Add notification read image to notification mail

[frankdekker]

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[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (c34d592) 100.00% compared to head (c78711c) 99.89%.

❗ Current head c78711c differs from pull request most recent head f723711. Consider uploading reports for the commit f723711 to get more accurate results

Files	Patch %	Lines
...pp/Notification/RuleNotificationReadController.php	0.00%	9 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              master     #504      +/-   ##
=============================================
- Coverage     100.00%   99.89%   -0.11%     
- Complexity      2753     2760       +7     
=============================================
  Files            485      488       +3     
  Lines           8243     8282      +39     
=============================================
+ Hits            8243     8273      +30     
- Misses             0        9       +9     

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