Move `commander` from `dependencies` to `devDependencies`
Move `commander` from `dependencies` to `devDependencies`

The aim is to provide a library to other packages, e.g. `linter-verification`.
There's no need to install `commander` in that case.

Standalone use of `dafny-transpiler` will be provided by releases,
which are self-contained, i.e. include all CLI dependencies in a single file.

Alchiadus/dafny-transpiler