feat(nix): nix and back again

I tried Nix, but it had too many downsides so I removed it.

1. Didn't like that all files are immutable and simple config changes
need a complete rebuild.
2. Setting up a new Mac didn't work as smoothly as promised. Not worth
the effort.
3. It sucked a lot to always have to type in the password twice on each
darwin-rebuild
4. It solves problems I never had.

.config/yazi/yazi.toml

@@ -0,0 +1,15 @@
+[log]
+enabled = false
+
+[manager]
+ratio = [1, 4, 3]
+show_hidden = false
+show_symlink = true
+sort_by = "natural"
+sort_dir_first = true
+sort_reverse = false
+sort_sensitive = false
+
+[[opener.edit]]
+block = true
+run = "nvim \"$@\""