Go embed

[markphelps]

Removes packr in favor of native go 1.16+ asset embedding

See https://blog.carlmjohnson.net/post/2021/how-to-use-go-embed/

[codecov-commenter]

Codecov Report

Merging #492 (54763d8) into master (c6f87c0) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #492      +/-   ##
==========================================
+ Coverage   82.49%   82.52%   +0.03%     
==========================================
  Files          16       16              
  Lines        1011     1013       +2     
==========================================
+ Hits          834      836       +2     
  Misses        144      144              
  Partials       33       33              

Impacted Files	Coverage Δ
server/rule.go	71.42% <0.00%> (+2.19%)	⬆️

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