Thank you all for your ideas and indeed helpful input. Pretty clearly everybody suggestes a personal static page. It is also good to hear which sites like-minded people visit. I'll try your suggestions and see what works best for me.
So, my new current plan is: I'll continue my efforts in building a personal web page as primary repository. I'll then post some of my projects to the sites you suggested, including this forum. That way I'll get some feedback and discussion going and don't have to worry if one of the external sites goes down, breaks or if my content simply gets lost between all the other contributions. Sounds good to me

@DrG Yes, I like the design of Geoff's page, too. Mislead by the grandiouse advertisement claims of "simple and complete customization" of both, suqarespace and wordpress, I thought it must be easy to get something to work with several static pages in different categories and an expanded menu on the left and have them doing all the SEO and stuff. Oh boooooy was I mistaken.

Three weeks deep into the rabbit hole I slowly come to the realization it could indeed be quicker to learn how to do SEO, social integration and resposiveness on my own than delaing with millions of poorly documented plugins. ;-) (I stopped staying up to date with my HTML skills just before HTML5 was first released in 2008. There's a lot for me to catch up on.)
@eblaster Thanks for the tip, I'll give hugo a try.