This makes standard use of shellcheck work without needing to provide extra configuration anywhere.
Also remove use of inline 'shellcheck disable' calls that are already defined in the .shellcheckrc and don't need to be set inline.
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dquote> This is a minimal config that can be used in conjunction with text editors to run linting during development. The initial rules are a subset of those we ignore across the codebase. A future update will add further rules as needed and cleanup the codebase.