fix: generate packages.md even if groups used

[boneskull]

Closes #471

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I have no idea if this is correct, and I didn't change any tests to support it; please let me know if a) this is correct, and b) if so, where I can add a test?

thanks!

[tgreyuk]

Thanks. This is published in typedoc-plugin-markdown@4.0.0-next.32 .

Currently a bunch of snapshot tests run against various combination of options and they are all passing. This use-case was not covered and I have no idea why that condition was in there. I'll get some docs together to explain how the tests (currently) work. A contributing guide is on its way but still tidying up a few bits.

[boneskull]

@tgreyuk As long as I have your attention--what is the equivalent of publicPath in v4.x? 😄

[tgreyuk]

@boneskull This option is now included in typedoc-plugin-markdown@4.0.0-next.33 - same behaviour as v3.