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/nvim/lua/plugins/chafa.lua

@@ -0,0 +1,20 @@
+-- View images in Neovim
+-- https://github.com/princejoogie/chafa.nvim
+return {
+  "princejoogie/chafa.nvim",
+  dependencies = {
+    "nvim-lua/plenary.nvim",
+    "m00qek/baleia.nvim",
+  },
+  config = function()
+    require("chafa").setup({
+      render = {
+        min_padding = 5,
+        show_label = true,
+      },
+      events = {
+        update_on_nvim_resize = true,
+      },
+    })
+  end,
+}