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/init.lua

@@ -0,0 +1,8 @@
+-- bootstrap lazy.nvim, LazyVim and your plugins
+require("config.lazy")
+
+-- Custom Highlight
+vim.api.nvim_set_hl(0, "WinSeparator", { fg = "#1F2334" })
+vim.api.nvim_set_hl(0, "DashboardHeader", { fg = "#A8CD76" })
+vim.api.nvim_set_hl(0, "DashboardFooter", { fg = "#A8CD76" })
+vim.api.nvim_set_hl(0, "DashboardIcon", { fg = "#A8CD76" })