markdown: améliore l'environnement markdown

- Installe les parsers pour markdown et markdown_inline.
- Ajoute et configure le plugins pour le colorscheme Nordic.
- Paramètre la correction orthographique pour l'anglais, le français et
  l'allemand.

Co-Authored-by: iGor milhit <igor@milhit.ch>

init.lua

@@ -130,11 +130,17 @@ require('lazy').setup({
   },
 
   {
-    -- Theme inspired by Atom
+    -- Nordic Theme
-    'navarasu/onedark.nvim',
+    'andersevenrud/nordic.nvim',
     priority = 1000,
     config = function()
-      vim.cmd.colorscheme 'onedark'
+      require('nordic').colorscheme({
+        underline_option = 'none',
+        italic = true,
+        italic_comments = false,
+        minimal_mode = false,
+        alternate_backgrounds = false
+      })
     end,
   },
 
@@ -145,7 +151,7 @@ require('lazy').setup({
     opts = {
       options = {
         icons_enabled = true,
-        theme = 'onedark',
+        theme = 'nord',
         component_separators = '|',
         section_separators = '/',
       },
@@ -205,6 +211,10 @@ require('lazy').setup({
   { import = 'custom.plugins' },
 }, {})
 
+-- Restore the site folder of .local/share/nvim/ in the runtime rewritten by
+-- lazy. See https://github.com/neovim/neovim/issues/23082#issuecomment-1510812311
+vim.opt.rtp:append (vim.fn.stdpath ('data') .. '/site')
+
 -- [[ Setting options ]]
 -- See `:help vim.o`
 -- NOTE: You can change these options as you wish!
@@ -253,6 +263,9 @@ vim.o.completeopt = 'menuone,noselect'
 -- NOTE: You should make sure your terminal supports this
 vim.o.termguicolors = true
 
+-- Set the spelling for English, French and German.
+vim.opt.spelllang = 'en,fr,de'
+
 -- [[ Basic Keymaps ]]
 
 -- Keymaps for better default experience
@@ -312,7 +325,7 @@ vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { de
 -- See `:help nvim-treesitter`
 require('nvim-treesitter.configs').setup {
   -- Add languages to be installed here that you want installed for treesitter
-  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'tsx', 'typescript', 'vimdoc', 'vim' },
+  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'markdown', 'markdown_inline', 'python', 'rust', 'tsx', 'typescript', 'vimdoc', 'vim' },
 
   -- Autoinstall languages that are not installed. Defaults to false (but you can change for yourself!)
   auto_install = false,