Remove github issue management

[benmatselby]

This is now in hagen: https://github.com/benmatselby/hagen

[codecov]

Codecov Report

Merging #17 into master will increase coverage by 3.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   37.23%   40.61%   +3.38%     
==========================================
  Files          13       10       -3     
  Lines         419      261     -158     
==========================================
- Hits          156      106      -50     
+ Misses        251      146     -105     
+ Partials       12        9       -3

Impacted Files	Coverage Δ
cmd/root.go	40% <ø> (-1.67%)	⬇️

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