How to use module mount for themes as symlinks no longer work in Hugo 0.123+

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Initialize your site as a module:

hugo mod init foo

In the above, foo is typically something like github.com/jmooring/my-site.

Then in your site config:

[[module.imports]]
path = "/Users/user/Git/parent-project.com/themes/my-theme"

When you do this, remove themes = ['foo'] from your site config. The module.imports is all you need.