[JOSS Review] Feedback to README.md

I am working on more feedback to the README, but for now only this much:

Currently your README.md is not rendered correctly on the landing page of the repository, because you have 4 instead of 3 ticks (`) on lines 38 and 42:

https://gitlab.fysik.su.se/operando-catalysis-spectroscopy/polariseval/-/blob/671782a2e4e6d0e5bd17468315d79abbdaea6165/README.md?plain=1#L38

https://gitlab.fysik.su.se/operando-catalysis-spectroscopy/polariseval/-/blob/671782a2e4e6d0e5bd17468315d79abbdaea6165/README.md?plain=1#L42

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