Move lsp config to local file structure

.config/nvim/lsp/phan.lua

@@ -0,0 +1,32 @@
+---@brief
+---
+--- https://github.com/phan/phan
+---
+--- Installation: https://github.com/phan/phan#getting-started
+
+local cmd = {
+  'phan',
+  '-m',
+  'json',
+  '--no-color',
+  '--no-progress-bar',
+  '-x',
+  '-u',
+  '-S',
+  '--language-server-on-stdin',
+  '--allow-polyfill-parser',
+}
+
+---@type vim.lsp.Config
+return {
+  cmd = cmd,
+  filetypes = { 'php' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    local cwd = assert(vim.uv.cwd())
+    local root = vim.fs.root(fname, { 'composer.json', '.git' })
+
+    -- prefer cwd if root is a descendant
+    on_dir(root and vim.fs.relpath(cwd, root) and cwd)
+  end,
+}