remove unused nix code

flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly-overlay':
    'github:nix-community/neovim-nightly-overlay/b7b3632fab34541543373254c265da03c1d0f240?narHash=sha256-SDLZMha2miaChOBGBkQJlTtk2kvcB7WIVVZ2l0/9byc%3D' (2025-10-01)
  → 'github:nix-community/neovim-nightly-overlay/7ff73a295b0065bde2f8b43b31558136ca77bd98?narHash=sha256-39JFRb006AOsIcOq%2B03H3y6YcGyaphk1CW5DRi14cOE%3D' (2025-10-13)
• Updated input 'neovim-nightly-overlay/flake-parts':
    'github:hercules-ci/flake-parts/4524271976b625a4a605beefd893f270620fd751?narHash=sha256-%2BuWLQZccFHwqpGqr2Yt5VsW/PbeJVTn9Dk6SHWhNRPw%3D' (2025-09-01)
  → 'github:hercules-ci/flake-parts/758cf7296bee11f1706a574c77d072b8a7baa881?narHash=sha256-wfG0S7pltlYyZTM%2BqqlhJ7GMw2fTF4mLKCIVhLii/4M%3D' (2025-10-01)
• Updated input 'neovim-nightly-overlay/git-hooks':
    'github:cachix/git-hooks.nix/54df955a695a84cd47d4a43e08e1feaf90b1fd9b?narHash=sha256-ytw7ROXaWZ7OfwHrQ9xvjpUWeGVm86pwnEd1QhzawIo%3D' (2025-09-17)
  → 'github:cachix/git-hooks.nix/cfc9f7bb163ad8542029d303e599c0f7eee09835?narHash=sha256-PTod9NG%2Bi3XbbnBKMl/e5uHDBYpwIWivQ3gOWSEuIEM%3D' (2025-10-03)
• Updated input 'neovim-nightly-overlay/neovim-src':
    'github:neovim/neovim/198c9e9bca7549cf7110be8c6f1df1c38d4e747f?narHash=sha256-oc1pPeoe8458X0r/Wum8CucVcJLlIp4mg%2B1HiOSVRgA%3D' (2025-09-30)
  → 'github:neovim/neovim/72b0bfa1fb7e897e5126aabae718a5480f466b9e?narHash=sha256-RnB%2BoJcP37YT9pjr1osUQtJc%2B1qcVyaaeSbiSyXwm1Y%3D' (2025-10-12)
• Updated input 'neovim-nightly-overlay/nixpkgs':
    'github:NixOS/nixpkgs/647e5c14cbd5067f44ac86b74f014962df460840?narHash=sha256-JVZl8NaVRYb0%2B381nl7LvPE%2BA774/dRpif01FKLrYFQ%3D' (2025-09-28)
  → 'github:NixOS/nixpkgs/362791944032cb532aabbeed7887a441496d5e6e?narHash=sha256-gKl2Gtro/LNf8P%2B4L3S2RsZ0G390ccd5MyXYrTdMCFE%3D' (2025-10-11)
• Updated input 'neovim-nightly-overlay/treefmt-nix':
    'github:numtide/treefmt-nix/5eda4ee8121f97b218f7cc73f5172098d458f1d1?narHash=sha256-ySNJ008muQAds2JemiyrWYbwbG%2BV7S5wg3ZVKGHSFu8%3D' (2025-09-24)
  → 'github:numtide/treefmt-nix/761ae7aff00907b607125b2f57338b74177697ed?narHash=sha256-gq9rdocpmRZCwLS5vsHozwB6b5nrOBDNc2kkEaTXHfg%3D' (2025-10-10)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d48b56f4899ee1d5377291576284969c9e37acc2?narHash=sha256-7G5fSMPNVwWNlFpZLwvKB8PUOaqPzFQbrtZ7RAzg2nw%3D' (2025-10-01)
  → 'github:NixOS/nixpkgs/09c05674757a82f32b67f70f702e56c4901a3cdd?narHash=sha256-IzUhHp/jU06jBW6S%2Bd12AO3sgq5yehYVTCBH7J6re5c%3D' (2025-10-13)

flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly-overlay/nixpkgs':
    'github:NixOS/nixpkgs/362791944032cb532aabbeed7887a441496d5e6e?narHash=sha256-gKl2Gtro/LNf8P%2B4L3S2RsZ0G390ccd5MyXYrTdMCFE%3D' (2025-10-11)
  → follows 'nixpkgs'

nvim/after/plugin/init.lua

@@ -0,0 +1,64 @@
+vim.cmd('colorscheme iofq')
+
+vim.g.mapleader = ' '
+vim.opt.autowrite = true
+vim.opt.backspace = 'indent,eol,start'
+vim.opt.confirm = true
+vim.opt.completeopt = 'menuone,popup,noselect,fuzzy'
+vim.opt.diffopt = 'internal,filler,closeoff,inline:char'
+vim.opt.expandtab = true -- insert tabs as spaces
+vim.opt.inccommand = 'split' -- incremental live completion
+vim.opt.laststatus = 1 -- statusline only if split
+vim.opt.nrformats:append('alpha') -- let Ctrl-a do letters as well
+vim.opt.path:append('**') -- enable fuzzy :find ing
+vim.opt.relativenumber = true
+vim.opt.shadafile = 'NONE' -- disable shada (unless session)
+vim.opt.shiftwidth = 0 -- >> shifts by tabstop
+vim.opt.showmatch = true -- highlight matching brackets
+vim.opt.showmode = true
+vim.opt.signcolumn = 'no'
+vim.opt.softtabstop = -1 -- backspace removes tabstop
+vim.opt.swapfile = false
+vim.opt.tabstop = 2 -- 2 space tabs are based
+vim.opt.updatetime = 250 -- decrease update time
+vim.opt.virtualedit = 'onemore'
+vim.opt.winborder = 'rounded'
+
+-- Configure Neovim diagnostic messages
+vim.diagnostic.config {
+  virtual_text = true,
+  underline = true,
+  severity_sort = true,
+  float = {
+    focusable = false,
+    style = 'minimal',
+    source = 'if_many',
+  },
+}
+
+vim.lsp.enable {
+  'nixd',
+  'phpactor',
+  'gopls',
+  'lua_ls',
+  'basedpyright',
+}
+
+local map = vim.keymap.set
+map('n', '\\t', function() -- Switch tab length on the fly
+  vim.o.tabstop = vim.o.tabstop == 8 and 2 or 2 * vim.o.tabstop
+  vim.notify('tabstop: ' .. vim.o.tabstop)
+end)
+map({ 'v', 'i' }, 'wq', '<esc>l')
+map('v', '<', '<gv')
+map('v', '>', '>gv')
+map('n', 'n', 'nzz', { noremap = true })
+map('n', 'N', 'Nzz', { noremap = true })
+map('n', '<C-u>', '<C-u>zz', { noremap = true })
+map('n', '<C-d>', '<C-d>zz', { noremap = true })
+map('n', 'gq', vim.cmd.bdelete, { noremap = true })
+map('n', 'gQ', function()
+  vim.cmd('bufdo bdelete')
+end, { noremap = true })
+
+vim.cmd.packadd('nvim.difftool')