shellcheck: fix vscode config and default to executable found on path

[skovhus]

Fixes #554

[codecov]

Codecov Report

Merging #555 (54a8774) into main (5cebe10) will decrease coverage by 0.17%.
The diff coverage is 69.23%.

❗ Current head 54a8774 differs from pull request most recent head c1dac4f. Consider uploading reports for the commit c1dac4f to get more accurate results

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
- Coverage   74.55%   74.37%   -0.18%     
==========================================
  Files          19       19              
  Lines         668      679      +11     
  Branches      118      120       +2     
==========================================
+ Hits          498      505       +7     
- Misses        154      158       +4     
  Partials       16       16              

Impacted Files	Coverage Δ
server/src/util/sh.ts	88.46% <ø> (ø)
server/src/linter.ts	86.07% <63.63%> (-3.78%)	⬇️
server/src/server.ts	58.76% <100.00%> (+0.21%)	⬆️

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