feat: checkbox based releases

[bcoe]

based on @alexander-fenster's recommendation I've simplified the design significantly; to create a release you now just click on a checkbox:

[codecov]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #77   +/-   ##
=======================================
  Coverage   82.42%   82.42%           
=======================================
  Files           5        5           
  Lines         330      330           
  Branches       26       26           
=======================================
  Hits          272      272           
  Misses         56       56           
  Partials        2        2

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[JustinBeckwith]

One question - what happens when I don't have access to cut a release?

[bcoe]

@JustinBeckwith, @alexander-fenster and my working theory was that you would need edit access to issues on the repo to check the box (which should mean it's appropriate for you to create a release).

I will confirm this as soon as we release.