Cross link in Quick Start guide more to other resources (like plugins)

[TimMonko]

I actually quite like the idea for linking to the documentation.

1. We don't have to maintain two places (like we failed to here)
2. It gives more detail on what is actualyl going on, especially if someone is in quickstart they don't even really necessarily know what a plugin is yet

Something like "To read additional file formats (e.g. .lif, .czi, .nd2), read more about using plugin readers in the open images guide"

I'm not super keen on that language so hopefully you can figure it out :)

Originally posted by @TimMonko in #976 (comment)