Remove global formatters and linters

Following commit 724753327, this removes all global formatters and
linters so I can move them into project-specific flake.nix and .nvim.lua
files.

modules/home-manager/coding/neovim/config/plugin/lint.lua

@@ -1,14 +1,7 @@
 local lint = require "lint"
 
-lint.linters_by_ft = {
-  dockerfile = { "hadolint" },
-  javascript = { "eslint_d" },
-  json = { "jsonlint" },
-  lua = { "luacheck" },
-  markdown = { "markdownlint" },
-  nix = { "nix" },
-  php = { "php", "phpcs", "phpstan" },
-}
+lint.linters_by_ft = {};
+
 local lint_augroup = vim.api.nvim_create_augroup("lint", { clear = true })
 
 vim.api.nvim_create_autocmd({ "BufEnter", "BufWritePost", "InsertLeave" }, {