Move lsp config to local file structure

.config/nvim/lsp/dts_lsp.lua

@@ -0,0 +1,22 @@
+---@brief
+---
+--- `dts-lsp` is an LSP for Devicetree files built on top of tree-sitter-devicetree grammar.
+--- Language servers can be used in many editors, such as Visual Studio Code, Emacs
+--- or Vim
+---
+--- Install `dts-lsp` from https://github.com/igor-prusov/dts-lsp and add it to path
+---
+--- `dts-lsp` doesn't require any configuration.
+---
+--- More about Devicetree:
+--- https://www.devicetree.org/
+--- https://docs.zephyrproject.org/latest/build/dts/index.html
+
+---@type vim.lsp.Config
+return {
+  name = 'dts_lsp',
+  cmd = { 'dts-lsp' },
+  filetypes = { 'dts', 'dtsi', 'overlay' },
+  root_markers = { '.git' },
+  settings = {},
+}