Wordpress vs. ModX vs. 'what do you like?'
I suggest using a flat-file CMS, which is easy to deploy and suited for your case. There are plenty, but I did really enjoy Automad.
If you still want something more sophisticated, I can recommend Contao CMS, which has lots of solid core features, is extendable and easy to install via their «Contao Manager».
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Recommendation of lightweight drawing application for math lectures?
I find GeoGebra a handy solution.
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