fix: incorporate small fixes from latest project setup #16
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This PR includes some small fixes that have been noticed while setting up a project with pymetrius.
Besides these, I also noticed that sphinx-spelling does not work any longer, because
ImportError: The 'enchant' C library was not found and maybe needs to be installed
(See: pyenchant/pyenchant#316). I saw that there is an open issue regarding sphinx -> mkdocs so I did not incorporate this already.