Move lsp config to local file structure

.config/nvim/lsp/foam_ls.lua

@@ -0,0 +1,29 @@
+---@brief
+---
+--- https://github.com/FoamScience/foam-language-server
+---
+--- `foam-language-server` can be installed via `npm`
+--- ```sh
+--- npm install -g foam-language-server
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'foam-ls', '--stdio' },
+  filetypes = { 'foam', 'OpenFOAM' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    for path in vim.fs.parents(fname) do
+      if vim.uv.fs_stat(path .. '/system/controlDict') then
+        on_dir(path)
+        return
+      end
+    end
+    local git_root = vim.fs.root(bufnr, { '.git' })
+    if git_root then
+      on_dir(git_root)
+      return
+    end
+    on_dir(vim.fs.dirname(fname))
+  end,
+}