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It is now able to add your own react elements into the left-nav.
PS: This is my first pull request ever, so I am not sure if I am doing it correctly.
I also want to say that I am using the left-nav in my own project, and I am using it for something else than a navigation menu. I found that the current solution is a good for adding my own elements into the left-nav. Maybe it is useful for others as well.
(an example can be seen in the image, where "This is a test" is added as optional content in the left-nav)