Move lsp config to local file structure

.config/nvim/lsp/remark_ls.lua

@@ -0,0 +1,46 @@
+---@brief
+---
+--- https://github.com/remarkjs/remark-language-server
+---
+--- `remark-language-server` can be installed via `npm`:
+--- ```sh
+--- npm install -g remark-language-server
+--- ```
+---
+--- `remark-language-server` uses the same
+--- [configuration files](https://github.com/remarkjs/remark/tree/main/packages/remark-cli#example-config-files-json-yaml-js)
+--- as `remark-cli`.
+---
+--- This uses a plugin based system. Each plugin needs to be installed locally using `npm` or `yarn`.
+---
+--- For example, given the following `.remarkrc.json`:
+---
+--- ```json
+--- {
+---   "presets": [
+---     "remark-preset-lint-recommended"
+---   ]
+--- }
+--- ```
+---
+--- `remark-preset-lint-recommended` needs to be installed in the local project:
+---
+--- ```sh
+--- npm install remark-preset-lint-recommended
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'remark-language-server', '--stdio' },
+  filetypes = { 'markdown' },
+  root_markers = {
+    '.remarkrc',
+    '.remarkrc.json',
+    '.remarkrc.js',
+    '.remarkrc.cjs',
+    '.remarkrc.mjs',
+    '.remarkrc.yml',
+    '.remarkrc.yaml',
+    '.remarkignore',
+  },
+}