glacials

Take a look at intelligent tiering for a good no-frills solution! Each item automatically determines its tier based on how often you access it.

I’d look at karlicoss’s personal data infrastructure for inspiration (or perhaps deterrent).

Obsidian is a fantastic note taking app that focuses on cross-linked notes, so is effectively a personal wiki.

It has a paid add on that lets you publish it to a website, or you can just do it yourself since the files are all Markdown.