Remove optional dependencies

[rabernat]

As discussed in https://github.com/oceanflux-ghg/FluxEngine/issues/60#issuecomment-925786300, matplotlib and jupyter are only needed for the tutorials, so are not hard package dependencies.

[rabernat]

Thanks again for your work on this package. It's been a month since I opened this pull request. Do you have any feedback?

[oceanflux-ghg]

hi Ryan, its on the list of planned updates, but we are currently focussing all of our efforts on the OceanSODA repo (as we need to finish it to get paid by the funder). We will switch our focus to the FluxEngine repo in a month or so. best wishes, Jamie

-- Dr Jamie Shutler Associate Professor of Earth observation Centre for Geography and Environmental Science (CGES) College of Life and Environmental Sciences University of Exeter

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Thanks again for your work on this package. It's been a month since I opened this pull request. Do you have any feedback?

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