Move lsp config to local file structure

.config/nvim/lsp/nimls.lua

@@ -0,0 +1,23 @@
+---@brief
+---
+--- https://github.com/PMunch/nimlsp
+---
+--- `nimlsp` can be installed via the `nimble` package manager:
+---
+--- ```sh
+--- nimble install nimlsp
+--- ```
+
+local util = require 'lspconfig.util'
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'nimlsp' },
+  filetypes = { 'nim' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    on_dir(
+      util.root_pattern '*.nimble'(fname) or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true })[1])
+    )
+  end,
+}