After installing Pico CMS (v2.0) according to its documentation,
I get the default "content-sample" which explains you how to get started by adding markdown files.
I did that (or at least I thought I did), but regardless of how many subfolders and .md pagefiles I've added:
I kept seeing the content-sample page, or a "404 site not found" error when trying to access a subarticle.
[SOLUTION]
I know this sounds obvious, but in my case, I already created subfolder structures and assumed that Pico would generate an Index for me, if there is no "index.md" file to load.You must have an "index.md" file in your main "content" subfolder!
Like Apache's folder listing.
Well Pico doesn't
But that's fine. I just didn't think that I had to take the docs that literally.
So after I've added this puzzle-key: "pico/content/index.md", all other subpages that 404'd before now loaded fine and properly.
Thanks Pico-devs!