Reorder cmd source to better conform to project layout advice

[aaronsky]

Description

Let's see if this makes the source any easier to reason about.

Type of Change

• [ ] Bug fix
• [ ] New feature
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How has this been Tested?

• Ran goreleaser locally on PC, Mac, and in a Mint VM

[codecov-io]

Codecov Report

Merging #38 into main will increase coverage by 0.51%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   64.14%   64.66%   +0.51%     
==========================================
  Files          36       35       -1     
  Lines        2365     2346      -19     
==========================================
  Hits         1517     1517              
+ Misses        760      741      -19     
  Partials       88       88              

Impacted Files	Coverage Δ
cmd/cider/main.go	61.53% <ø> (ø)
pkg/cmd/check.go	0.00% <ø> (ø)
pkg/cmd/completions.go	0.00% <ø> (ø)
pkg/cmd/config.go	100.00% <ø> (ø)
pkg/cmd/error.go	100.00% <ø> (ø)
pkg/cmd/init.go	53.29% <ø> (ø)
pkg/cmd/release.go	0.00% <ø> (ø)
pkg/cmd/root.go	0.00% <0.00%> (ø)

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