I am sorry, that my old web page disappeared for several month now…
I used a flat-file CMS I found on the web which did look nice, but was not maintained for many, many years. Unfortunately, this CMS is still advertised, although it does not work anymore with actual PHP versions, which is a requirement from my web hoster (and a security risk in general).
I tried a lot to fix it, but it was simply a “neverending story”. As I could not rely that it will ever work again, I decided to scrap it.
Another reason why I had to do this was my “old” webhoster. I had a German one, which I felt they were more and more ripping off their customers. It was always a pain to set up SSL (as they wanted their customers to use their paid solution, which was not cheap at all for something which is standard nowadays). Support was slow and also not really user friendly. And, as the final trigger for me so to say, they started to convert mail accounts to a Microsoft 365 solution, where the included mail accounts with the hosting package where very limited. Besides, I could not be sure anymore that my mails are not processed somewhere in the US without my knowledge by some AI or whatever. And for all that, it was simply too expensive to keep it running like that. If I want to get ripped off with my private data, I'd use Google services which are mostly free (in terms of money, not privacy 
).
Now, I transferred all my domains to an Austrian hoster, which I should have chosen right from the beginning. Fair pricing, excellent support, modern administration interface. And I could even continue my domains in the “old” update cycle, without immediately paying for them again. Finally, all data is stored in my home country.
But - I have to build my web site again up from the ground. This time I will use DokuWIKI, which seems to be actively developed for quite some time now…
Please be patient, I'll bring back all the stuff again, but it will take some time. And I have to learn to work with this new environment. I am not retired and still need to work for my living, I even decided after more than 25 years in the industry to start a new career in academia…
Meanwhile, you can find my old pages on the wayback machine. Please, support them from time to time with some donations, as I do as well…