So, to cut things short: I threw out previous website and made a new one.
It is still just a few static pages, but this time they are not hand-made, but managed by Lektor CMS. So far I just copied contents, there is still a lot of styling and upgrading to do, but hopefully it should be easier to maintain than before.
As you can see I also started a weblog. Hopefully I will have something interesting to write...