Support config in `~/.config`

[doismellburning]

More things use XDG_CONFIG_HOME now

This is great in theory, but unsupported by my dotfiles right now

ec67c41 was the ground work to modify bootstrap to e.g. also look at $DOTFILES/*.config and symlink those into $XDG_CONFIG_HOME/

I initially thought a high proportion of the things I have that use it - also write there and/or have secrets and/or machine-specific config there. But actually looking at both abaddon (macOS) and baal (Debian):

• btop: ✅ autogenerated, but static, fine
• gh: ✅ config.yml would be perfect for dotfiles (aliases!) - hosts.yml probably too (protocol, user, etc.)
• ghostty: ✅ config generated by dotfiles (hacky, but it works!)
• go: 😐 dynamic stuff, but it's only a bunch of telemetry I probably don't want anyway(!)
• io.datasette.llm: ⛔ lots of stuff for simonw's llm, some of it secrets (keys.json), some of it storage (logs.db)
• nvim: ✅ static config

So actually maybe I do just manage entire dirs in my dotfiles?