Move lsp config to local file structure

.config/nvim/lsp/ltex.lua

@@ -0,0 +1,85 @@
+---@brief
+---
+--- https://github.com/valentjn/ltex-ls
+---
+--- LTeX Language Server: LSP language server for LanguageTool 🔍✔️ with support for LaTeX 🎓, Markdown 📝, and others
+---
+--- To install, download the latest [release](https://github.com/valentjn/ltex-ls/releases) and ensure `ltex-ls` is on your path.
+---
+--- This server accepts configuration via the `settings` key.
+---
+--- ```lua
+---   settings = {
+--- 		ltex = {
+--- 			language = "en-GB",
+--- 		},
+--- 	},
+--- ```
+---
+--- To support org files or R sweave, users can define a custom filetype autocommand (or use a plugin which defines these filetypes):
+---
+--- ```lua
+--- vim.cmd [[ autocmd BufRead,BufNewFile *.org set filetype=org ]]
+--- ```
+
+local language_id_mapping = {
+  bib = 'bibtex',
+  plaintex = 'tex',
+  rnoweb = 'rsweave',
+  rst = 'restructuredtext',
+  tex = 'latex',
+  pandoc = 'markdown',
+  text = 'plaintext',
+}
+
+local filetypes = {
+  'bib',
+  'gitcommit',
+  'markdown',
+  'org',
+  'plaintex',
+  'rst',
+  'rnoweb',
+  'tex',
+  'pandoc',
+  'quarto',
+  'rmd',
+  'context',
+  'html',
+  'xhtml',
+  'mail',
+  'text',
+}
+
+local function get_language_id(_, filetype)
+  local language_id = language_id_mapping[filetype]
+  if language_id then
+    return language_id
+  else
+    return filetype
+  end
+end
+local enabled_ids = {}
+do
+  local enabled_keys = {}
+  for _, ft in ipairs(filetypes) do
+    local id = get_language_id({}, ft)
+    if not enabled_keys[id] then
+      enabled_keys[id] = true
+      table.insert(enabled_ids, id)
+    end
+  end
+end
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'ltex-ls' },
+  filetypes = filetypes,
+  root_markers = { '.git' },
+  get_language_id = get_language_id,
+  settings = {
+    ltex = {
+      enabled = enabled_ids,
+    },
+  },
+}