Rewrite tags

[nic-hartley]

Currently everything still kinda assumes everything is a piece of tuig, but a few don't. I should pick one:

• Start treating each sub-project as its own thing with its own tags. (Probably ew: they're not separate projects; but if they were gonna be I should split them into their own repos)
• Treat each sub-project as a sub-project of tuig (so tuig-ui, despite being a separate crate, gets treated like it's tuig::ui -- a system, whose "systems" are components)
• Treat each sub-project as the "starting point", so e.g. there'd be p: tuig and p: tuig-iosys, then s: ge-runner and s: io-render

Or the labels might just not be that helpful: Maybe they should be saved for when there's more than one person working on the project. Or used for tracking status/kind/project only, not system/component/whatever.