Switch from `feGaussianBlur` to `filter:blur` #335

[xerc]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (91f9928) 86.77% compared to head (22288de) 86.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
- Coverage   86.77%   86.71%   -0.06%     
==========================================
  Files           9        9              
  Lines         446      444       -2     
  Branches       75       75              
==========================================
- Hits          387      385       -2     
  Misses         53       53              
  Partials        6        6              

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