a note-taking/note-making app comes to my mind: Obsidian

it's a very powerful tool but has a learning curve, very easy to link/backlink to any notes you previous took, best of all, it has a graph view to literally see how your notes link together, you should definitely look it up.

however:

1. it's not web-based, however, you can sync your notes by using Cloud services so you can access it on any device (Obsidian charges $8 per month for syncing, but you can work around it by using your personal cloud for free)
2. it doesn't run in Docker.

It's getting a bit older. But I use Zim on Linux for Year now. It's a text editor similar to a personal WIKI. You do have options to create a Todo List with Checkbox. It support a couple of plugin too.

The only draw back: it's a desktop application.

Take a look: https://zim-wiki.org/

DokuWiki. Quite a few natty plugins to go with it, light, simple, host anywhere.

I have recently switched to the markdown editor Obsidian, r/ObsidianMD. It’s just markdown files, so you can access them anywhere if you have them saved in a cloud folder. Finding your files can be done easily with tags or links, which is very useful. There are also a ton of plugins which enhance Obsidian significantly, for instance Dataview.