feat: Add CSS LSPs

flake.nix

@@ -155,6 +155,7 @@
           sqlfluff
           stdenv.cc.cc
           stylelint
+          stylelint-lsp
           stylua
           tailwindcss-language-server
           taplo

lua/plugins/nvim-lspconfig.lua

@@ -1,11 +1,20 @@
+-- For cssls.
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities.textDocument.completion.completionItem.snippetSupport = true
+
 return {
   {
     'neovim/nvim-lspconfig',
     opts = {
       servers = {
+        cssls = {
+          capabilities = capabilities,
+        },
+
         html = {
           filetypes = { 'html', 'liquid' },
         },
+
         nil_ls = {
           settings = {
             ['nil'] = {
@@ -16,6 +25,8 @@ return {
             },
           },
         },
+
+        stylelint_lsp = {},
       },
     },
   },